This test inserts a editable image, performs an undo, then a redo, ensuring that the selection remains after the image when re-done.

before undo:
| "Hello, world!"
| <img>
|   height="300px"
|   style="display: block"
|   width="100%"
|   x-apple-editable-image=""
|   <shadow:root>
|     <attachment>
|       style="display: none !important;"
| <#selection-caret>

after undo:
| "Hello, world!<#selection-caret>"

after redo:
| "Hello, world!"
| <img>
|   height="300px"
|   style="display: block"
|   width="100%"
|   x-apple-editable-image=""
|   <shadow:root>
|     <attachment>
|       style="display: none !important;"
| <#selection-caret>