From 4343e23e0486a1789b14bb12ca489ba573e0064e Mon Sep 17 00:00:00 2001
From: buddh4 <mail@jharrer.de>
Date: Wed, 18 Mar 2020 18:55:14 +0100
Subject: [PATCH] Enh #3928: Add default `Stream.initScroll` with support of
 IntersectionObserver

---
 composer.json                                 |   1 +
 composer.lock                                 | 628 +++++++++++-------
 protected/humhub/assets/AppAsset.php          |   1 +
 .../IntersectionObserverPolyfillAsset.php     |  40 ++
 protected/humhub/docs/CHANGELOG_DEV.md        |   1 +
 .../activity/resources/js/humhub.activity.js  |  67 +-
 .../resources/js/humhub.stream.Stream.js      |  61 +-
 .../stream/resources/js/humhub.stream.wall.js |  34 +-
 8 files changed, 503 insertions(+), 330 deletions(-)
 create mode 100644 protected/humhub/assets/IntersectionObserverPolyfillAsset.php

diff --git a/composer.json b/composer.json
index 8b4df06be9..89fe334541 100644
--- a/composer.json
+++ b/composer.json
@@ -36,6 +36,7 @@
         "npm-asset/select2-bootstrap-theme": "0.1.0-beta.4",
         "npm-asset/bootstrap-tour": "0.11.0",
         "npm-asset/swiped-events": "1.0.9",
+        "npm-asset/intersection-observer": "^0.7.0",
         "cebe/markdown": "1.0.2",
         "firebase/php-jwt": "^5.0",
         "jbroadway/urlify": "^1.0",
diff --git a/composer.lock b/composer.lock
index 1e857b8acb..3a7cfa04dc 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,23 +1,25 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "20a6062be83639e35f120e8207109814",
+    "hash": "6e01b28d8fac3eb6812434caa45dc069",
+    "content-hash": "1ea6b490122d16bce47d98849bffc587",
     "packages": [
         {
             "name": "bower-asset/bootstrap",
             "version": "v3.4.1",
             "source": {
                 "type": "git",
-                "url": "git@github.com:twbs/bootstrap.git",
+                "url": "https://github.com/twbs/bootstrap.git",
                 "reference": "68b0d231a13201eb14acd3dc84e51543d16e5f7e"
             },
             "dist": {
                 "type": "zip",
                 "url": "https://api.github.com/repos/twbs/bootstrap/zipball/68b0d231a13201eb14acd3dc84e51543d16e5f7e",
-                "reference": "68b0d231a13201eb14acd3dc84e51543d16e5f7e"
+                "reference": "68b0d231a13201eb14acd3dc84e51543d16e5f7e",
+                "shasum": null
             },
             "require": {
                 "bower-asset/jquery": ">=1.9.1,<4.0"
@@ -38,7 +40,8 @@
             "dist": {
                 "type": "zip",
                 "url": "https://api.github.com/repos/RobinHerbots/Inputmask/zipball/5e670ad62f50c738388d4dcec78d2888505ad77b",
-                "reference": "5e670ad62f50c738388d4dcec78d2888505ad77b"
+                "reference": "5e670ad62f50c738388d4dcec78d2888505ad77b",
+                "shasum": null
             },
             "require": {
                 "bower-asset/jquery": ">=1.7"
@@ -53,13 +56,14 @@
             "version": "3.4.1",
             "source": {
                 "type": "git",
-                "url": "git@github.com:jquery/jquery-dist.git",
+                "url": "https://github.com/jquery/jquery-dist.git",
                 "reference": "15bc73803f76bc53b654b9fdbbbc096f56d7c03d"
             },
             "dist": {
                 "type": "zip",
                 "url": "https://api.github.com/repos/jquery/jquery-dist/zipball/15bc73803f76bc53b654b9fdbbbc096f56d7c03d",
-                "reference": "15bc73803f76bc53b654b9fdbbbc096f56d7c03d"
+                "reference": "15bc73803f76bc53b654b9fdbbbc096f56d7c03d",
+                "shasum": null
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             "type": "bower-asset",
             "license": [
@@ -71,13 +75,14 @@
             "version": "1.12.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/components/jqueryui.git",
+                "url": "git@github.com:components/jqueryui.git",
                 "reference": "44ecf3794cc56b65954cc19737234a3119d036cc"
             },
             "dist": {
                 "type": "zip",
                 "url": "https://api.github.com/repos/components/jqueryui/zipball/44ecf3794cc56b65954cc19737234a3119d036cc",
-                "reference": "44ecf3794cc56b65954cc19737234a3119d036cc"
+                "reference": "44ecf3794cc56b65954cc19737234a3119d036cc",
+                "shasum": null
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@@ -98,7 +103,8 @@
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                 "type": "zip",
                 "url": "https://api.github.com/repos/bestiejs/punycode.js/zipball/38c8d3131a82567bfef18da09f7f4db68c84f8a3",
-                "reference": "38c8d3131a82567bfef18da09f7f4db68c84f8a3"
+                "reference": "38c8d3131a82567bfef18da09f7f4db68c84f8a3",
+                "shasum": null
             },
             "type": "bower-asset"
         },
@@ -113,7 +119,8 @@
             "dist": {
                 "type": "zip",
                 "url": "https://api.github.com/repos/yiisoft/jquery-pjax/zipball/aef7b953107264f00234902a3880eb50dafc48be",
-                "reference": "aef7b953107264f00234902a3880eb50dafc48be"
+                "reference": "aef7b953107264f00234902a3880eb50dafc48be",
+                "shasum": null
             },
             "require": {
                 "bower-asset/jquery": ">=1.8"
@@ -181,7 +188,7 @@
                 "markdown",
                 "markdown-extra"
             ],
-            "time": "2015-03-06T05:21:16+00:00"
+            "time": "2015-03-06 05:21:16"
         },
         {
             "name": "container-interop/container-interop",
@@ -213,7 +220,7 @@
             "description": "Promoting the interoperability of container objects (DIC, SL, etc.)",
             "homepage": "https://github.com/container-interop/container-interop",
             "abandoned": "psr/container",
-            "time": "2017-02-14T19:40:03+00:00"
+            "time": "2017-02-14 19:40:03"
         },
         {
             "name": "ezyang/htmlpurifier",
@@ -260,27 +267,27 @@
             "keywords": [
                 "html"
             ],
-            "time": "2019-10-28T03:44:26+00:00"
+            "time": "2019-10-28 03:44:26"
         },
         {
             "name": "firebase/php-jwt",
-            "version": "v5.0.0",
+            "version": "v5.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/firebase/php-jwt.git",
-                "reference": "9984a4d3a32ae7673d6971ea00bae9d0a1abba0e"
+                "reference": "4566062c68f76f43d44f1643f4970fe89757d4c6"
             },
             "dist": {
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-                "url": "https://api.github.com/repos/firebase/php-jwt/zipball/9984a4d3a32ae7673d6971ea00bae9d0a1abba0e",
-                "reference": "9984a4d3a32ae7673d6971ea00bae9d0a1abba0e",
+                "url": "https://api.github.com/repos/firebase/php-jwt/zipball/4566062c68f76f43d44f1643f4970fe89757d4c6",
+                "reference": "4566062c68f76f43d44f1643f4970fe89757d4c6",
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             },
             "require": {
                 "php": ">=5.3.0"
             },
             "require-dev": {
-                "phpunit/phpunit": " 4.8.35"
+                "phpunit/phpunit": "^4.8|^5"
             },
             "type": "library",
             "autoload": {
@@ -306,7 +313,7 @@
             ],
             "description": "A simple library to encode and decode JSON Web Tokens (JWT) in PHP. Should conform to the current spec.",
             "homepage": "https://github.com/firebase/php-jwt",
-            "time": "2017-06-27T22:17:23+00:00"
+            "time": "2020-02-24 23:15:03"
         },
         {
             "name": "imagine/imagine",
@@ -364,7 +371,7 @@
                 "image manipulation",
                 "image processing"
             ],
-            "time": "2017-05-16T10:31:22+00:00"
+            "time": "2017-05-16 10:31:22"
         },
         {
             "name": "jbroadway/urlify",
@@ -423,7 +430,7 @@
                 "url",
                 "urlify"
             ],
-            "time": "2019-12-13T19:53:11+00:00"
+            "time": "2019-12-13 19:53:11"
         },
         {
             "name": "kartik-v/bootstrap-fileinput",
@@ -476,7 +483,7 @@
                 "progress",
                 "upload"
             ],
-            "time": "2019-12-13T10:21:22+00:00"
+            "time": "2019-12-13 10:21:22"
         },
         {
             "name": "kartik-v/bootstrap-star-rating",
@@ -520,7 +527,7 @@
                 "star",
                 "svg"
             ],
-            "time": "2019-05-25T06:53:46+00:00"
+            "time": "2019-05-25 06:53:46"
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@@ -567,7 +574,7 @@
                 "option",
                 "select"
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-            "time": "2019-03-09T10:53:11+00:00"
+            "time": "2019-03-09 10:53:11"
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@@ -619,7 +626,7 @@
                 "widget",
                 "yii2"
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-            "time": "2019-03-13T17:14:54+00:00"
+            "time": "2019-03-13 17:14:54"
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@@ -671,7 +678,7 @@
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-            "time": "2019-02-23T19:45:01+00:00"
+            "time": "2019-02-23 19:45:01"
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@@ -720,7 +727,7 @@
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-            "time": "2014-11-09T04:56:27+00:00"
+            "time": "2014-11-09 04:56:27"
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@@ -775,7 +782,7 @@
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                 "yii2"
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-            "time": "2017-03-10T17:08:52+00:00"
+            "time": "2017-03-10 17:08:52"
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@@ -829,7 +836,7 @@
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                 "yii2"
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-            "time": "2018-09-12T03:12:07+00:00"
+            "time": "2018-09-12 03:12:07"
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@@ -883,7 +890,7 @@
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-            "time": "2018-10-09T11:34:49+00:00"
+            "time": "2018-10-09 11:34:49"
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@@ -937,7 +944,7 @@
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                 "yii2"
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-            "time": "2019-05-29T12:28:51+00:00"
+            "time": "2019-05-29 12:28:51"
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@@ -991,7 +998,7 @@
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                 "yii2"
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-            "time": "2019-04-19T07:02:48+00:00"
+            "time": "2019-04-19 07:02:48"
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@@ -1046,7 +1053,7 @@
                 "widget",
                 "yii2"
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-            "time": "2019-04-19T11:45:08+00:00"
+            "time": "2019-04-19 11:45:08"
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@@ -1095,7 +1102,7 @@
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                 "yii2"
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-            "time": "2015-05-03T08:23:04+00:00"
+            "time": "2015-05-03 08:23:04"
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@@ -1149,7 +1156,7 @@
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-            "time": "2018-09-07T10:05:08+00:00"
+            "time": "2018-09-07 10:05:08"
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@@ -1205,7 +1212,7 @@
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-            "time": "2018-09-16T09:30:44+00:00"
+            "time": "2018-09-16 09:30:44"
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@@ -1259,7 +1266,7 @@
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-            "time": "2019-11-15T16:16:16+00:00"
+            "time": "2019-11-15 16:16:16"
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@@ -1308,7 +1315,7 @@
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-            "time": "2014-11-09T08:07:23+00:00"
+            "time": "2014-11-09 08:07:23"
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@@ -1361,7 +1368,7 @@
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-            "time": "2018-10-09T11:54:03+00:00"
+            "time": "2018-10-09 11:54:03"
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@@ -1411,7 +1418,7 @@
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-            "time": "2016-01-10T16:47:35+00:00"
+            "time": "2016-01-10 16:47:35"
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@@ -1465,7 +1472,7 @@
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-            "time": "2018-10-09T11:58:19+00:00"
+            "time": "2018-10-09 11:58:19"
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@@ -1520,7 +1527,7 @@
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             ],
-            "time": "2018-09-05T11:59:34+00:00"
+            "time": "2018-09-05 11:59:34"
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@@ -1573,7 +1580,7 @@
                 "widget",
                 "yii2"
             ],
-            "time": "2019-05-29T12:06:56+00:00"
+            "time": "2019-05-29 12:06:56"
         },
         {
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@@ -1640,34 +1647,34 @@
                 "widget",
                 "yii2"
             ],
-            "time": "2018-10-09T17:40:19+00:00"
+            "time": "2018-10-09 17:40:19"
         },
         {
             "name": "markbaker/complex",
-            "version": "1.4.7",
+            "version": "1.4.8",
             "source": {
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                 "url": "https://github.com/MarkBaker/PHPComplex.git",
-                "reference": "1ea674a8308baf547cbcbd30c5fcd6d301b7c000"
+                "reference": "8eaa40cceec7bf0518187530b2e63871be661b72"
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-                "reference": "1ea674a8308baf547cbcbd30c5fcd6d301b7c000",
+                "url": "https://api.github.com/repos/MarkBaker/PHPComplex/zipball/8eaa40cceec7bf0518187530b2e63871be661b72",
+                "reference": "8eaa40cceec7bf0518187530b2e63871be661b72",
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             "require-dev": {
-                "dealerdirect/phpcodesniffer-composer-installer": "^0.4.3",
-                "phpcompatibility/php-compatibility": "^8.0",
+                "dealerdirect/phpcodesniffer-composer-installer": "^0.5.0",
+                "phpcompatibility/php-compatibility": "^9.0",
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                 "phpunit/phpunit": "^4.8.35|^5.4.0",
                 "sebastian/phpcpd": "2.*",
-                "squizlabs/php_codesniffer": "^3.3.0"
+                "squizlabs/php_codesniffer": "^3.4.0"
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@@ -1735,7 +1742,7 @@
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                 "mathematics"
             ],
-            "time": "2018-10-13T23:28:42+00:00"
+            "time": "2020-03-11 20:15:49"
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@@ -1804,7 +1811,7 @@
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                 "vector"
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-            "time": "2019-10-06T11:29:25+00:00"
+            "time": "2019-10-06 11:29:25"
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@@ -1844,14 +1851,16 @@
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                 "random"
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-            "time": "2018-04-16T19:31:57+00:00"
+            "time": "2018-04-16 19:31:57"
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             "version": "0.8.2",
             "dist": {
                 "type": "tar",
-                "url": "https://registry.npmjs.org/after/-/after-0.8.2.tgz"
+                "url": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
+                "reference": null,
+                "shasum": null
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@@ -1863,7 +1872,9 @@
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             "dist": {
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-                "url": "https://registry.npmjs.org/animate.css/-/animate.css-3.7.2.tgz"
+                "url": "https://registry.npmjs.org/animate.css/-/animate.css-3.7.2.tgz",
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+                "shasum": null
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@@ -1875,7 +1886,9 @@
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+                "shasum": null
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-                "url": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz"
+                "url": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.1.tgz",
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+                "shasum": null
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-                "url": "https://registry.npmjs.org/at.js/-/at.js-1.5.4.tgz"
+                "url": "https://registry.npmjs.org/at.js/-/at.js-1.5.4.tgz",
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+                "shasum": null
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@@ -1911,7 +1928,9 @@
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+                "url": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
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+                "shasum": null
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-                "url": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-0.1.5.tgz"
+                "url": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-0.1.5.tgz",
+                "reference": null,
+                "shasum": null
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-                "url": "https://registry.npmjs.org/better-assert/-/better-assert-1.0.2.tgz"
+                "url": "https://registry.npmjs.org/better-assert/-/better-assert-1.0.2.tgz",
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+                "shasum": null
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-                "url": "https://registry.npmjs.org/blob/-/blob-0.0.5.tgz"
+                "url": "https://registry.npmjs.org/blob/-/blob-0.0.5.tgz",
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+                "shasum": null
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@@ -1956,7 +1981,9 @@
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-                "url": "https://registry.npmjs.org/bluebird/-/bluebird-3.7.2.tgz"
+                "url": "https://registry.npmjs.org/bluebird/-/bluebird-3.7.2.tgz",
+                "reference": null,
+                "shasum": null
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-                "url": "https://registry.npmjs.org/blueimp-canvas-to-blob/-/blueimp-canvas-to-blob-3.5.0.tgz"
+                "url": "https://registry.npmjs.org/blueimp-canvas-to-blob/-/blueimp-canvas-to-blob-3.5.0.tgz",
+                "reference": null,
+                "shasum": null
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                 "template"
             ],
-            "time": "2015-06-21T13:50:34+00:00"
+            "time": "2015-06-21 13:50:34"
         },
         {
             "name": "phpunit/php-timer",
@@ -5571,7 +5705,7 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2017-02-26T11:10:40+00:00"
+            "time": "2017-02-26 11:10:40"
         },
         {
             "name": "phpunit/php-token-stream",
@@ -5620,7 +5754,7 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2017-11-27T05:48:46+00:00"
+            "time": "2017-11-27 05:48:46"
         },
         {
             "name": "phpunit/phpunit",
@@ -5704,7 +5838,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2019-02-01T05:22:47+00:00"
+            "time": "2019-02-01 05:22:47"
         },
         {
             "name": "phpunit/phpunit-mock-objects",
@@ -5764,7 +5898,7 @@
                 "xunit"
             ],
             "abandoned": true,
-            "time": "2018-08-09T05:50:03+00:00"
+            "time": "2018-08-09 05:50:03"
         },
         {
             "name": "psr/http-message",
@@ -5814,7 +5948,7 @@
                 "request",
                 "response"
             ],
-            "time": "2016-08-06T14:39:51+00:00"
+            "time": "2016-08-06 14:39:51"
         },
         {
             "name": "psr/log",
@@ -5861,7 +5995,7 @@
                 "psr",
                 "psr-3"
             ],
-            "time": "2019-11-01T11:05:21+00:00"
+            "time": "2019-11-01 11:05:21"
         },
         {
             "name": "ralouphie/getallheaders",
@@ -5901,7 +6035,7 @@
                 }
             ],
             "description": "A polyfill for getallheaders.",
-            "time": "2019-03-08T08:55:37+00:00"
+            "time": "2019-03-08 08:55:37"
         },
         {
             "name": "sebastian/code-unit-reverse-lookup",
@@ -5946,7 +6080,7 @@
             ],
             "description": "Looks up which function or method a line of code belongs to",
             "homepage": "https://github.com/sebastianbergmann/code-unit-reverse-lookup/",
-            "time": "2017-03-04T06:30:41+00:00"
+            "time": "2017-03-04 06:30:41"
         },
         {
             "name": "sebastian/comparator",
@@ -6010,7 +6144,7 @@
                 "compare",
                 "equality"
             ],
-            "time": "2018-02-01T13:46:46+00:00"
+            "time": "2018-02-01 13:46:46"
         },
         {
             "name": "sebastian/diff",
@@ -6062,7 +6196,7 @@
             "keywords": [
                 "diff"
             ],
-            "time": "2017-08-03T08:09:46+00:00"
+            "time": "2017-08-03 08:09:46"
         },
         {
             "name": "sebastian/environment",
@@ -6112,7 +6246,7 @@
                 "environment",
                 "hhvm"
             ],
-            "time": "2017-07-01T08:51:00+00:00"
+            "time": "2017-07-01 08:51:00"
         },
         {
             "name": "sebastian/exporter",
@@ -6179,7 +6313,7 @@
                 "export",
                 "exporter"
             ],
-            "time": "2019-09-14T09:02:43+00:00"
+            "time": "2019-09-14 09:02:43"
         },
         {
             "name": "sebastian/global-state",
@@ -6230,7 +6364,7 @@
             "keywords": [
                 "global state"
             ],
-            "time": "2017-04-27T15:39:26+00:00"
+            "time": "2017-04-27 15:39:26"
         },
         {
             "name": "sebastian/object-enumerator",
@@ -6277,7 +6411,7 @@
             ],
             "description": "Traverses array structures and object graphs to enumerate all referenced objects",
             "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
-            "time": "2017-08-03T12:35:26+00:00"
+            "time": "2017-08-03 12:35:26"
         },
         {
             "name": "sebastian/object-reflector",
@@ -6322,7 +6456,7 @@
             ],
             "description": "Allows reflection of object attributes, including inherited and non-public ones",
             "homepage": "https://github.com/sebastianbergmann/object-reflector/",
-            "time": "2017-03-29T09:07:27+00:00"
+            "time": "2017-03-29 09:07:27"
         },
         {
             "name": "sebastian/recursion-context",
@@ -6375,7 +6509,7 @@
             ],
             "description": "Provides functionality to recursively process PHP variables",
             "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
-            "time": "2017-03-03T06:23:57+00:00"
+            "time": "2017-03-03 06:23:57"
         },
         {
             "name": "sebastian/resource-operations",
@@ -6417,7 +6551,7 @@
             ],
             "description": "Provides a list of PHP built-in functions that operate on resources",
             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "time": "2015-07-28T20:34:47+00:00"
+            "time": "2015-07-28 20:34:47"
         },
         {
             "name": "sebastian/version",
@@ -6460,7 +6594,7 @@
             ],
             "description": "Library that helps with managing the version number of Git-hosted PHP projects",
             "homepage": "https://github.com/sebastianbergmann/version",
-            "time": "2016-10-03T07:35:21+00:00"
+            "time": "2016-10-03 07:35:21"
         },
         {
             "name": "symfony/browser-kit",
@@ -6517,7 +6651,7 @@
             ],
             "description": "Symfony BrowserKit Component",
             "homepage": "https://symfony.com",
-            "time": "2017-07-12T13:03:20+00:00"
+            "time": "2017-07-12 13:03:20"
         },
         {
             "name": "symfony/console",
@@ -6586,7 +6720,7 @@
             ],
             "description": "Symfony Console Component",
             "homepage": "https://symfony.com",
-            "time": "2017-07-29T21:27:59+00:00"
+            "time": "2017-07-29 21:27:59"
         },
         {
             "name": "symfony/css-selector",
@@ -6639,7 +6773,7 @@
             ],
             "description": "Symfony CssSelector Component",
             "homepage": "https://symfony.com",
-            "time": "2017-05-01T15:01:29+00:00"
+            "time": "2017-05-01 15:01:29"
         },
         {
             "name": "symfony/debug",
@@ -6695,7 +6829,7 @@
             ],
             "description": "Symfony Debug Component",
             "homepage": "https://symfony.com",
-            "time": "2017-07-28T15:27:31+00:00"
+            "time": "2017-07-28 15:27:31"
         },
         {
             "name": "symfony/dom-crawler",
@@ -6751,7 +6885,7 @@
             ],
             "description": "Symfony DomCrawler Component",
             "homepage": "https://symfony.com",
-            "time": "2017-05-25T23:10:31+00:00"
+            "time": "2017-05-25 23:10:31"
         },
         {
             "name": "symfony/event-dispatcher",
@@ -6814,7 +6948,7 @@
             ],
             "description": "Symfony EventDispatcher Component",
             "homepage": "https://symfony.com",
-            "time": "2017-06-09T14:53:08+00:00"
+            "time": "2017-06-09 14:53:08"
         },
         {
             "name": "symfony/finder",
@@ -6863,20 +6997,20 @@
             ],
             "description": "Symfony Finder Component",
             "homepage": "https://symfony.com",
-            "time": "2017-06-01T21:01:25+00:00"
+            "time": "2017-06-01 21:01:25"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.13.1",
+            "version": "v1.14.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "7b4aab9743c30be783b73de055d24a39cf4b954f"
+                "reference": "34094cfa9abe1f0f14f48f490772db7a775559f2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/7b4aab9743c30be783b73de055d24a39cf4b954f",
-                "reference": "7b4aab9743c30be783b73de055d24a39cf4b954f",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/34094cfa9abe1f0f14f48f490772db7a775559f2",
+                "reference": "34094cfa9abe1f0f14f48f490772db7a775559f2",
                 "shasum": ""
             },
             "require": {
@@ -6888,7 +7022,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.13-dev"
+                    "dev-master": "1.14-dev"
                 }
             },
             "autoload": {
@@ -6922,7 +7056,7 @@
                 "portable",
                 "shim"
             ],
-            "time": "2019-11-27T14:18:11+00:00"
+            "time": "2020-01-13 11:15:53"
         },
         {
             "name": "symfony/yaml",
@@ -6977,7 +7111,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2017-07-23T12:43:26+00:00"
+            "time": "2017-07-23 12:43:26"
         },
         {
             "name": "theseer/tokenizer",
@@ -7017,20 +7151,20 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2019-06-13T22:48:21+00:00"
+            "time": "2019-06-13 22:48:21"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.6.0",
+            "version": "1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "573381c0a64f155a0d9a23f4b0c797194805b925"
+                "reference": "aed98a490f9a8f78468232db345ab9cf606cf598"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/573381c0a64f155a0d9a23f4b0c797194805b925",
-                "reference": "573381c0a64f155a0d9a23f4b0c797194805b925",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/aed98a490f9a8f78468232db345ab9cf606cf598",
+                "reference": "aed98a490f9a8f78468232db345ab9cf606cf598",
                 "shasum": ""
             },
             "require": {
@@ -7065,7 +7199,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2019-11-24T13:36:37+00:00"
+            "time": "2020-02-14 12:15:55"
         },
         {
             "name": "yiisoft/yii2-debug",
@@ -7112,7 +7246,7 @@
                 "debugger",
                 "yii2"
             ],
-            "time": "2018-09-23T21:41:04+00:00"
+            "time": "2018-09-23 21:41:04"
         },
         {
             "name": "yiisoft/yii2-faker",
@@ -7159,7 +7293,7 @@
                 "faker",
                 "yii2"
             ],
-            "time": "2018-02-19T20:27:10+00:00"
+            "time": "2018-02-19 20:27:10"
         },
         {
             "name": "yiisoft/yii2-gii",
@@ -7208,7 +7342,7 @@
                 "gii",
                 "yii2"
             ],
-            "time": "2018-12-08T10:07:49+00:00"
+            "time": "2018-12-08 10:07:49"
         }
     ],
     "aliases": [],
diff --git a/protected/humhub/assets/AppAsset.php b/protected/humhub/assets/AppAsset.php
index 5888c94af2..8646fdeb05 100755
--- a/protected/humhub/assets/AppAsset.php
+++ b/protected/humhub/assets/AppAsset.php
@@ -84,6 +84,7 @@ class AppAsset extends AssetBundle
         'humhub\assets\OpenSansAsset',
         'humhub\assets\HighlightJsAsset',
         'humhub\assets\SwipedEventsAssets',
+        IntersectionObserverPolyfillAsset::class,
     ];
 
     /**
diff --git a/protected/humhub/assets/IntersectionObserverPolyfillAsset.php b/protected/humhub/assets/IntersectionObserverPolyfillAsset.php
new file mode 100644
index 0000000000..dc106ac281
--- /dev/null
+++ b/protected/humhub/assets/IntersectionObserverPolyfillAsset.php
@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * @link https://www.humhub.org/
+ * @copyright Copyright (c) 2017 HumHub GmbH & Co. KG
+ * @license https://www.humhub.com/licences
+ */
+
+namespace humhub\assets;
+
+use yii\web\AssetBundle;
+
+/**
+ * animate.css
+ *
+ * @author buddha
+ */
+class IntersectionObserverPolyfillAsset extends AssetBundle
+{
+
+    /**
+     * @inheritdoc
+     */
+    public $sourcePath = '@npm/intersection-observer';
+
+    /**
+     * @inheritdoc
+     */
+    public $js = ['intersection-observer.js'];
+
+    /**
+     * @inheritdoc
+     */
+    public $publishOptions = [
+        'only' => [
+            'intersection-observer.js'
+        ]
+    ];
+
+}
diff --git a/protected/humhub/docs/CHANGELOG_DEV.md b/protected/humhub/docs/CHANGELOG_DEV.md
index 6b9b5d6692..239f0aaa13 100644
--- a/protected/humhub/docs/CHANGELOG_DEV.md
+++ b/protected/humhub/docs/CHANGELOG_DEV.md
@@ -25,3 +25,4 @@ HumHub Change Log (DEVELOP)
 - Enh #3924: Implement `Stream.onUpdateAvailable()`, `Stream.loadUpdate()` and `Stream.options.autoUpdate` to manage stream updates
 - Enh #3924: Added `humhub\modules\content\live\NewContent:$streamChannel`
 - Enh #3928: Implement auto updates on activity stream
+- Enh #3928: Add default `Stream.initScroll` with support of IntersectionObserver
diff --git a/protected/humhub/modules/activity/resources/js/humhub.activity.js b/protected/humhub/modules/activity/resources/js/humhub.activity.js
index 5c956f80be..a660b6c548 100644
--- a/protected/humhub/modules/activity/resources/js/humhub.activity.js
+++ b/protected/humhub/modules/activity/resources/js/humhub.activity.js
@@ -49,8 +49,9 @@ humhub.module('activity', function (module, require, $) {
      * @returns {undefined}
      */
     var ActivityStream = stream.Stream.extend(function (container, options) {
-        var that = this;
         stream.Stream.call(this, container, {
+            scrollSupport: true,
+            scrollOptions: { rootMargin: "30px" },
             initLoadCount: STREAM_INIT_COUNT,
             loadCount: STREAM_LOAD_COUNT,
             autoUpdate: true,
@@ -58,6 +59,24 @@ humhub.module('activity', function (module, require, $) {
         });
     });
 
+    ActivityStream.prototype.initEvents = function(events) {
+        var that = this;
+        this.on('humhub:stream:afterAddEntries', function() {
+            if(!that.$content.getNiceScroll().length) {
+                that.$content.niceScroll({
+                    cursorwidth: "7",
+                    cursorborder: "",
+                    cursorcolor: "#555",
+                    cursoropacitymax: "0.2",
+                    nativeparentscrolling: false,
+                    railpadding: {top: 0, right: 3, left: 0, bottom: 0}
+                });
+            } else {
+                that.$content.getNiceScroll().resize();
+            }
+        });
+    };
+
     ActivityStream.prototype.isUpdateAvailable = function(events) {
         var that = this;
 
@@ -83,52 +102,6 @@ humhub.module('activity', function (module, require, $) {
         return updatesAvailable;
     };
 
-    ActivityStream.prototype.initScroll = function () {
-        if(!this.$content.is(':visible')) {
-            return;
-        }
-
-        // listen for scrolling event yes or no
-        var scrolling = true;
-        var that = this;
-        this.$content.scroll(function (evt) {
-            if(that.lastEntryLoaded()) {
-                return;
-            }
-            // save height of the overflow container
-            var _containerHeight = that.$content.height();
-            // save scroll height
-            var _scrollHeight = that.$content.prop("scrollHeight");
-            // save current scrollbar position
-            var _currentScrollPosition = that.$content.scrollTop();
-
-            // load more activites if current scroll position is near scroll height
-            if (_currentScrollPosition >= (_scrollHeight - _containerHeight - 30)) {
-                // checking if ajax loading is necessary or the last entries are already loaded
-                if (scrolling) {
-                    scrolling = false;
-                    // load more activities
-                    that.loadEntries({loader: true}).then(function() {
-                        that.$content.getNiceScroll().resize();
-                    }).finally(function () {
-                        scrolling = true;
-                    });
-                }
-            }
-        });
-
-
-        // set niceScroll to activity list
-        that.$content.niceScroll({
-            cursorwidth: "7",
-            cursorborder: "",
-            cursorcolor: "#555",
-            cursoropacitymax: "0.2",
-            nativeparentscrolling: false,
-            railpadding: {top: 0, right: 3, left: 0, bottom: 0}
-        });
-    };
-
     ActivityStream.templates = {
         streamMessage: '<div class="streamMessage activity"><div class="panel-body">{message}</div></div>'
     };
diff --git a/protected/humhub/modules/stream/resources/js/humhub.stream.Stream.js b/protected/humhub/modules/stream/resources/js/humhub.stream.Stream.js
index bd92639527..e91af34d98 100644
--- a/protected/humhub/modules/stream/resources/js/humhub.stream.Stream.js
+++ b/protected/humhub/modules/stream/resources/js/humhub.stream.Stream.js
@@ -23,6 +23,10 @@ humhub.module('stream.Stream', function (module, require, $) {
     var loader = require('ui.loader');
     var event = require('event');
 
+    var EVENT_AFTER_ADD_ENTRIES = 'humhub:stream:afterAddEntries';
+    var EVENT_BEFORE_ADD_ENTRIES = 'humhub:stream:beforeAddEntries';
+    var EVENT_INITIALIZED = 'humhub:stream:initialized';
+
     /**
      * Number of initial stream entries loaded when stream is initialized.
      * @type Number
@@ -69,13 +73,39 @@ humhub.module('stream.Stream', function (module, require, $) {
      * @param {type} container id or jQuery object of the stream container
      * @returns {undefined}
      */
-    var Stream = Widget.extend(function (container, options) {
-        Widget.call(this, container, options);
-    });
+    var Stream = Widget.extend();
 
     Stream.prototype.onClear = function() {/* abstract onClear function */};
 
-    Stream.prototype.initScroll = function() {/* abstract initScroll function */};
+    Stream.prototype.initScroll = function() {
+        if(window.IntersectionObserver && this.options.scrollSupport) {
+
+            var options = { root: this.$content[0], rootMargin: "50px" };
+            options = this.options.scrollOptions ? $.extend(options, this.options.scrollOptions) : options;
+            var $streamEnd = $('<div class="stream-end"></div>');
+            this.$content.append($streamEnd);
+
+            var that = this;
+            var observer = new IntersectionObserver(function(entries) {
+                if(that.preventScrollLoading()) {
+                    return;
+                }
+
+                if(entries.length && entries[0].isIntersecting) {
+                    that.load().finally(function() {
+                        that.state.scrollLock = false;
+                    });
+                }
+
+            }, options);
+
+            observer.observe($streamEnd[0]);
+        }
+    };
+
+    Stream.prototype.preventScrollLoading = function() {
+        return this.state.scrollLock || !this.canLoadMore() || !this.state.lastRequest || this.state.firstRequest.isSingleEntryRequest()
+    };
 
     Stream.prototype.initEvents = function() {/* abstract initScroll function */};
 
@@ -100,6 +130,10 @@ humhub.module('stream.Stream', function (module, require, $) {
 
             that.onUpdateAvailable();
         });
+
+        this.on(EVENT_INITIALIZED, function() {
+            that.initScroll();
+        });
     };
 
     Stream.prototype.isUpdateAvailable = function(events) {
@@ -138,6 +172,7 @@ humhub.module('stream.Stream', function (module, require, $) {
             .loadInit()
             .then($.proxy(this.handleResponse, this))
             .then($.proxy(this.updateTop, this))
+            .then($.proxy(this.triggerInitEvent, this))
             .catch($.proxy(this.handleLoadError, this));
     };
 
@@ -155,13 +190,17 @@ humhub.module('stream.Stream', function (module, require, $) {
         return response;
     };
 
+    Stream.prototype.triggerInitEvent = function(response) {
+        this.trigger(EVENT_INITIALIZED, this);
+        return response;
+    };
+
     Stream.prototype.initWidget = function() {
         this.$content = this.$.find(this.options.contentSelector);
         this.loader = this.options.loader || new StreamLoader(this);
         this.initDefaultEvents();
         this.initEvents();
         this.initFilter();
-        this.initScroll();
     };
 
     Stream.prototype.initFilter = function () {
@@ -328,7 +367,7 @@ humhub.module('stream.Stream', function (module, require, $) {
             return Promise.resolve();
         }
 
-        this.$.trigger('humhub:stream:beforeAddEntries', [request.response, request, $result]);
+        this.$.trigger(EVENT_BEFORE_ADD_ENTRIES, [request.response, request, $result]);
 
         var promise;
 
@@ -341,7 +380,7 @@ humhub.module('stream.Stream', function (module, require, $) {
         }
 
         return promise.then(function () {
-            that.trigger('humhub:stream:afterAddEntries', [request.response, request, $result]);
+            that.trigger(EVENT_AFTER_ADD_ENTRIES, [request.response, request, $result]);
             return request;
         });
     };
@@ -399,8 +438,14 @@ humhub.module('stream.Stream', function (module, require, $) {
      * @param html
      */
     Stream.prototype.appendEntry = function (html) {
+        var that = this;
         return this._streamEntryAnimation(html, function ($html) {
-            this.$content.append($html);
+            var $streamEnd = that.$content.find('.stream-end:first');
+            if($streamEnd.length) {
+                $streamEnd.before($html)
+            } else {
+                this.$content.append($html);
+            }
         });
     };
 
diff --git a/protected/humhub/modules/stream/resources/js/humhub.stream.wall.js b/protected/humhub/modules/stream/resources/js/humhub.stream.wall.js
index 7b8672e6fe..105d8bf159 100644
--- a/protected/humhub/modules/stream/resources/js/humhub.stream.wall.js
+++ b/protected/humhub/modules/stream/resources/js/humhub.stream.wall.js
@@ -13,7 +13,7 @@
 humhub.module('stream.wall', function (module, require, $) {
 
     var stream = require('stream');
-    var BaseStream = stream.Stream;
+    var Stream = stream.Stream;
     var Component = require('action').Component;
     var Widget = require('ui.widget').Widget;
     var event = require('event');
@@ -34,13 +34,15 @@ humhub.module('stream.wall', function (module, require, $) {
      * @param {type} cfg
      * @returns {undefined}
      */
-    var WallStream = BaseStream.extend(function (container, options) {
+    var WallStream = Stream.extend(function (container, options) {
         options = options || {};
 
+        options.scrollSupport = true;
+        options.scrollOptions = { root: null, rootMargin: "300px" };
         options.filter =  Component.instance($('#wall-stream-filter-nav'), {stream : this});
         options.pinSupport = !this.isDashboardStream();
 
-        BaseStream.call(this, container, options);
+        Stream.call(this, container, options);
 
         if (module.config.horizontalImageScrollOnMobile && /Android|webOS|iPhone|iPad|iPod|BlackBerry|BB|PlayBook|IEMobile|Windows Phone|Kindle|Silk|Opera Mini/i.test(navigator.userAgent)) {
             this.$.addClass('mobile');
@@ -225,7 +227,7 @@ humhub.module('stream.wall', function (module, require, $) {
              }, 10000);
         }
 
-    }
+    };
 
     WallStream.template = {
         loadSuppressedButton: '<div class="load-suppressed" style="display:none;"><a href="#" data-action-click="loadSuppressed" data-entry-key="{key}" data-action-block="manual" data-ui-loader><i class="fa fa-chevron-down"></i>&nbsp;&nbsp;{message}&nbsp;&nbsp;<span class="badge">{contentName}</span></a></div>',
@@ -247,30 +249,6 @@ humhub.module('stream.wall', function (module, require, $) {
         });
     };
 
-    WallStream.prototype.initScroll = function() {
-        var that = this;
-        $(window).off('scroll.wallStream').on('scroll.wallStream', function () {
-            if(that.state.scrollLock || !that.canLoadMore() || !that.state.lastRequest || that.state.firstRequest.isSingleEntryRequest()) {
-                return;
-            }
-
-            var $window = $(window);
-            var windowHeight = $window.height();
-            var windowBottom = $window.scrollTop() + windowHeight;
-            var elementBottom = that.$.offset().top + that.$.outerHeight();
-            var remaining = elementBottom - windowBottom;
-            if (remaining <= 300) {
-                that.state.scrollLock = true;
-                $('#btn-load-more').hide();
-                setTimeout(function () {
-                    that.loadEntries().finally(function() {
-                        that.state.scrollLock = false;
-                    });
-                });
-            }
-        });
-    };
-
     WallStream.prototype.onClear = function() {
         this.$.find('.back_button_holder').hide();
     };