https://bugs.kde.org/show_bug.cgi?id=397618

            Bug ID: 397618
           Summary: undo sometimes erases whole layer chunk
           Product: krita
           Version: unspecified
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: General
          Assignee: krita-bugs-n...@kde.org
          Reporter: k...@ghostintheshell.33mail.com
  Target Milestone: ---

Created attachment 114494
  --> https://bugs.kde.org/attachment.cgi?id=114494&action=edit
visual representation of error occuring

I am using krita version 4.0.3 , but i was unable to specify that in the report
field and since i rather finish my current work in a "stable" environment i
have no way to test it for now in a newer versions. I am pretty sure it's
something i have experienced in the previous versions, at least in 4.* branch.

I am working on a big canvas (4096x7016 px) and sometimes when i try to undo
the stroke, what ends up happening is that i end up with missing rectangular
"chunk" of a layer i'm working on, where the stroke was present (see
attachment, where i have tried to visualize that. The cyan rectangle is not
something that actually shows up on the canvas, it's just here to illustrate
what i think ends up getting missing, since it's always a rectangular chunk
around stroke). 

It might be happening when i use undo, while the document is autosaving, but it
don't really have the reliable way to test that manually. 

My other guess is that it happens when i am running out of RAM and system
starts using the swap for storage.

There are no errors that end up in stdout/stderr in console.

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