Make clicking edit tag button easier

Currently, tags will be dragged immediately on touch, which makes it very hard to click the edit button, as any non-perfect touch drags the tag. This commit adds a delay on mobile devices only, so that the tag can be both dragged and edited easily.

Closes https://github.com/flarum/core/issues/3098

extensions/tags/js/src/admin/components/TagsPage.js

@@ -150,6 +150,9 @@ export default class TagsPage extends ExtensionPage {
     this.$('.TagList').get().map(e => {
       sortable.create(e, {
         group: 'tags',
+        delay: 50,
+        delayOnTouchOnly: true,
+        touchStartThreshold: 5,
         animation: 150,
         swapThreshold: 0.65,
         dragClass: 'sortable-dragging',