T/430: The `BalloonToolbar` should not blink when the editor receives focus
Suggested merge commit message (convention)
Type: The BalloonToolbar should not blink when the editor receives focus. Closes ckeditor/ckeditor5#5480.
Additional information
Requires a small correction in the image tests https://github.com/ckeditor/ckeditor5-image/tree/t/ckeditor5-ui/430.
@oleq do you want to keep this PR alive? Or could we close it and just keep the branch? I presume you're not planning to get back to this anytime soon.
I can still reproduce it in Letters so the issue is valid.
It's unlikely though we're going to schedule some time to work on it anytime soon.
On the third hand, I'd hate to lose the code BC I saw there's a lot of rocket science involved (research, ASCII art :P) and this could be a nice starting point in the future.