Hi @dkazakov
Unfortunatelly, I can’t test the appimage 
When I try to open files, krita crash with following message:
ASSERT: "!md5.isEmpty()" in file /home/appimage/persistent/krita/libs/resources/KoResource.cpp, line 154
How can I do to test it? Is there an option or something else I can activate when running appimage to avoid this kind of error? (last time I got this problem on an appimage, I had to download source code, apply modification from commit, remove assert, compile… 
)
Here @halla told me appimage do not enable assert/safe assert
Is it possible to generate a testing appimage with disabled assert?
I’m really curious to test this version, because as you an see in my comment here, I took care to deactivate the autosave for all tests relative to clone limits:
So if this appimage solve the problem for autosave AND the problem of clones limits AND problem of superfluous updates of transform mask, it would be really great 
Grum999