Fix positions iteration when starting in an inline void node (#4952)

.changeset/little-plums-behave.md

@@ -0,0 +1,5 @@
+---
+'slate': patch
+---
+
+Fix positions iteration when starting inside an inline void node

packages/slate/src/interfaces/editor.ts

@@ -1341,6 +1341,9 @@ export const Editor: EditorInterface = {
         // then we will iterate over their content.
         if (!voids && editor.isVoid(node)) {
           yield Editor.start(editor, path)
+          // It's possible the start of the range we're iterating over is in a void, in which case
+          // we want to make sure we don't incorrectly yield the start of a subsequent text node for unit !== 'offset'
+          isNewBlock = false
           continue
         }
 

packages/slate/test/interfaces/Editor/positions/range/start-in-void.tsx

@@ -0,0 +1,31 @@
+/** @jsx jsx */
+import { Editor } from 'slate'
+import { jsx } from '../../../..'
+
+export const input = (
+  <editor>
+    <block>
+      one
+      <inline void>
+        <text />
+      </inline>
+      two
+    </block>
+  </editor>
+)
+export const test = editor => {
+  return Array.from(
+    Editor.positions(editor, {
+      at: {
+        anchor: { path: [0, 1, 0], offset: 0 },
+        focus: { path: [0, 2], offset: 2 },
+      },
+      unit: 'character',
+    })
+  )
+}
+export const output = [
+  { path: [0, 1, 0], offset: 0 },
+  { path: [0, 2], offset: 1 },
+  { path: [0, 2], offset: 2 },
+]