Region returns on Undo

[tonsky]

• Ctrl+I on a region
• Edit inside it
• Cmd+Z

Expected: text returns, region does not Actual: both text and region return. Region could not be removed anymore

https://user-images.githubusercontent.com/285292/138785162-7b4e7328-d01e-41fb-8cff-401b6db640c5.mov