Fix deletion of hanging range with trailing void block node (#4125)

Only unhang the range if the end of the range doesn't match the end of the document.

packages/slate/src/transforms/text.ts

@@ -101,8 +101,13 @@ export const TextTransforms: TextTransforms = {
       }
 
       if (!hanging) {
+        const [, end] = Range.edges(at)
+        const endOfDoc = Editor.end(editor, [])
+
+        if (!Point.equals(end, endOfDoc)) {
           at = Editor.unhangRange(editor, at, { voids })
         }
+      }
 
       let [start, end] = Range.edges(at)
       const startBlock = Editor.above(editor, {

packages/slate/test/transforms/delete/selection/block-void-end-hanging.tsx

@@ -0,0 +1,27 @@
+/** @jsx jsx */
+import { Transforms } from 'slate'
+import { jsx } from '../../..'
+
+export const run = editor => {
+  Transforms.delete(editor)
+}
+export const input = (
+  <editor>
+    <block>
+      <anchor />
+      This is a first paragraph
+    </block>
+    <block>This is the second paragraph</block>
+    <block void />
+    <block>
+      <focus />
+    </block>
+  </editor>
+)
+export const output = (
+  <editor>
+    <block>
+      <cursor />
+    </block>
+  </editor>
+)

packages/slate/test/transforms/delete/selection/block-void-end.tsx

@@ -0,0 +1,26 @@
+/** @jsx jsx */
+import { Transforms } from 'slate'
+import { jsx } from '../../..'
+
+export const run = editor => {
+  Transforms.delete(editor)
+}
+export const input = (
+  <editor>
+    <block>
+      <anchor />
+      This is a first paragraph
+    </block>
+    <block>This is the second paragraph</block>
+    <block void>
+      <focus />
+    </block>
+  </editor>
+)
+export const output = (
+  <editor>
+    <block>
+      <cursor />
+    </block>
+  </editor>
+)