"Paint inside" behavior should be a paint option with the new default modes
Submitted by Jehan
Someone was noting on twitter a difference between GIMP and MyPaint/Krita about painting over transparency in some modes: https://twitter.com/not_surt/status/886923586065252353
According to IRC discussion, the new "Default" modes behaves like MyPaint whereas the legacy won't. On the other hand, the old behavior have their usefulness as well, as noted (painting inside current painting without bothering with selections or masks).
< pippin>the 'default' modes have that configurability as well though, but not exposed for painting
We should therefore expose this option so that both behaviors are possible with the new modes.
Version: git master