https://bugs.kde.org/show_bug.cgi?id=458471

Hologram <intu...@protonmail.com> changed:

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--- Comment #2 from Hologram <intu...@protonmail.com> ---
I am also noticing this on Krita 5.1.1+ on Windows 10. 

SUMMARY
Large file layers with a transform mask associated show noticeable slowdown
when locking and unlocking the layer. That is because the layers are recomputed
despite there being no visual change. 

STEPS TO REPRODUCE
1. I made an A2 CAD export and imported this PDF @300 DPI as a file layer in
Krita. It's an (4960 x 7016 px image) when loaded in.
2. Then I added a transform mask to move the PDF to the center of my document,
which is A3 size, 300 DPI.
3. (optional) Added a colour overlay (so the white background is grey and
easier on the eyes). 

OBSERVATION
Locking and unlocking prompts a loading bar to recompute the layer. The larger
the file is on placement, the longer this computation takes. 

EXPECTED RESULT
Krita shouldn't recompute the layer, when I haven't made any visual changes to
it. 

If you wonder why I made a larger export than the file I am drawing on, it's
because I only need to manage one export that I can than rescale and move
around at hearts content as opposed to multiple smaller files.

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