ScaleManipulator: register undo when selection/layer is translated

[dsizzle]

Fixes #493

I didn't update canvas resize, because a pure translate in that case really is nothing.

[humdingerb]

Something's wrong. One time it crashed: ArtPaint-15093-debug-19-03-2023-19-02-11.report.txt

Plus:

• Move something with Scale to the left. RETURN. -> Undo resets the position alright, but adds some part of the image at the top
• Move something with Scale to the right. RETURN. -> Part of the image is repeated on the left side.

[dsizzle]

is this better?

[humdingerb]

I'm afraid not... See for example:

https://user-images.githubusercontent.com/6107158/226387868-0e5a5f21-1e66-44b0-8399-95cca71d18fa.mp4

Hope that clip works...

Easy to reproduce:

• ALT+E
• Move down and left, partially outside the canvas
• ALT+Z

[dsizzle]

The clip doesn't work. I also can't reproduce:

ALT+E, move down and left, partially outside canvas:

Undo (or ALT+Z):

No issue:

Same thing with a selection. Can you try uploading a different video?

[humdingerb]

Terribly sorry, I seem to have not used the latest build when trying yesterday. Or it only works on odd days... :} Anyway, the fix is good. And we merge...

[dsizzle]

hahaha, no worries at all. It wouldn't be the first time I couldn't reproduce something. Also sometimes these "easy" ones turn out to be quite difficult - so I don't judge. Thanks!