https://bugs.kde.org/show_bug.cgi?id=361619

            Bug ID: 361619
           Summary: Input event lag/drop-out when OpenGL is ON with large
                    window
           Product: krita
           Version: 3.0 Alpha
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: OpenGL Canvas
          Assignee: krita-bugs-n...@kde.org
          Reporter: tyson...@mail.com

In Krita 3.0 Alpha (Krita-3.0-Alpha-master-e5109c2-x86_64.AppImage), when
OpenGL is ON and Krita's window is large -- 1920x1080 maximized window, or a
windows that is almost that big but not maximized, I can notice input lag from
my graphics tablet and mouse. Some curves I drew even has straight line
sessions in them, probably due to event drop-out.

When Krita's window is smaller -- around 1280x800 or 960x1080, the lagging
seems to be much less noticeable. When OpenGL is OFF, the lag didn't happen at
all.

I will upload screenshots and tablet logs for each testcase.

Reproducible: Always

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