Need to click undo twice to undo dropping an image

[Piotrek Koszuliński]

1. Open ​http://tests.ckeditor.dev:1030/tests/plugins/uploadwidget/manual/image
2. Drop an image.
3. While it's uploading, click the "x" in the notification. Perhaps you can also do some other action, but I observed that clicking notification is ok. Perhaps it's related to focus.
4. Wait for the upload to finish.
5. Click "undo".

• Expected: Image should be removed.
• Actual: Nothing happens.

[Piotrek Koszuliński]

Note - if this turns out to be a tricky case to solve, I'm ok with postponing it. It's not a crucial issue.

[Piotr Jasiun]

Interesting, because when you move the selection, focus/blur upload widget during upload only 1 undo is needs. But in fact if you close notification or just blur editor, then two undos are needed.

[Piotrek Koszuliński]

It's a DUP of a ticket about classes order in widget wrapper.