Reverted 03861af (#4804) and added a test for the exception it caused (#4858)

.changeset/purple-walls-kiss.md

@@ -0,0 +1,5 @@
+---
+'slate': patch
+---
+
+Reverted #4804 as it triggered an exception when inserting text with multi-block selection

packages/slate/src/transforms/text.ts

@@ -487,8 +487,7 @@ export const TextTransforms: TextTransforms = {
           if (!voids && Editor.void(editor, { at: end })) {
             return
           }
-          const start = Range.start(at)
-          const pointRef = Editor.pointRef(editor, start)
+          const pointRef = Editor.pointRef(editor, end)
           Transforms.delete(editor, { at, voids })
           at = pointRef.unref()!
           Transforms.setSelection(editor, { anchor: at, focus: at })

packages/slate/test/transforms/insertText/selection/block-across.tsx

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