Cannot undo if entire text is deleted

[simonzack]

If I select all the text, and hit backspace, undo (control-Z) won't work. This doesn't happen with the delete key, however.

Tested on firefox 32 windows 7.

[aladagemre]

I have the same thing on MacOS. I can not undo after backspace. I can undo after Cmd+Backspace. I think this is an important issue.