https://bugs.kde.org/show_bug.cgi?id=401940

            Bug ID: 401940
           Summary: More than one Assistant Tool causes black rectangle to
                    appear
           Product: krita
           Version: 4.1.5
          Platform: MS Windows
                OS: MS Windows
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: Tool/Assistants
          Assignee: krita-bugs-n...@kde.org
          Reporter: weavermarqu...@gmail.com
  Target Milestone: ---

SUMMARY

Placing multiple assistants makes a black rectangle appear across the canvas
near where they are placed. This bug is major as it severely limits the
usability of the assistants tool.

STEPS TO REPRODUCE
1. Place an area covering assistant tool
2. Place another area covering assistant tool
3. A black bar will flicker or cover the canvas at various zooms.

OBSERVED RESULT

A large black rectangle appears at various zooms.

 https://i.imgur.com/vZlxqks.jpg

There seems to be a "safe range" of zooms, between 54% and 100% inclusive,
where there is no black rectangle and everything appears normally. When I go
aboce 100% to about 140%, there are only a few locations on the screen where
the black rectangle does not cover the screen, typically looking a safe
distance away from the assistant tools.

This applies to the vanishing point, rectangle, concentric ellipse, plane,
perspective, and fish eye assistants. I have not tried the others.


EXPECTED RESULT
I expect to be able to use multiple assistant tools to display without causing
black rectangles to show up.

Thank you very much for your time and effort on Krita.

ADDITIONAL INFORMATION
Krita
  Version: 4.1.5

Qt
  Version (compiled): 5.9.3
  Version (loaded): 5.9.3

OS Information
  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.17134
  Pretty Productname: Windows 10 (10.0)
  Product Type: windows
  Product Version: 10

OpenGL Info
  **OpenGL not initialized**

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