Undo of Selection->Invert doesn't work properly

[dsizzle]

Steps to reproduce:

1. Make a selection with a hole in the center
2. Choose Selection->Invert
3. Choose Undo (ALT + Z)
4. Choose Selection->Grow a few times

Expected results:

Actual results:

... for some reason the Undo of the Invert selection loses the hole in the center. If you don't Undo, but rather just Invert again, it works fine.

[dsizzle]

ugggh.... this appears to have been broken with #526 - and it appears that holes in selections are not treated properly, which is why they get lost, not just in this case.

For example:

1. Load Walter image
2. Select all non-transparent
3. Ctrl+Alt+T to Translate it, hit Ok
4. Fill the selection and note that the gaps between the letters got filled, but they shouldn't.

[humdingerb]

Uh oh, a topological embarrassment. Holy moly. Looks like Mr. Moore of #526 wasn't wholly correct...

[dsizzle]

Well, I don't blame him. I should've done moore testing...

[humdingerb]

Nice one! 😃