https://bugs.kde.org/show_bug.cgi?id=404201

            Bug ID: 404201
           Summary: Brush tool glitches, possibly related to tool
                    switching
           Product: krita
           Version: git master
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Tools
          Assignee: krita-bugs-n...@kde.org
          Reporter: storm.ant...@gmail.com
  Target Milestone: ---

Built master today, and now experiencing glitches in the brush tool. I have
found two ways to trigger glitches. I don't know if these are related issues,
but they both appeared after my latest rebuild.

git c5b490f is still good.



Glitch 1:
=====================

STEPS TO REPRODUCE
1. Use "Pick foreground color from current layer" (Ctrl + Alt + LMB)

OBSERVED RESULT
The color pick preview will appear transparent instead of solid. After this a
textured brush will paint with the texture inverted (paint where it shouldn't,
and vice versa)

Color picking normally using Ctrl + LMB works properly.



Glitch 2:
=====================

STEPS TO REPRODUCE
1. Move the cursor over the layers docker and use it, eg. hover until preview
appears, click on layers etc.
2. Move cursor back over canvas so it switches back to brush tool

OBSERVED RESULT
One or more of these happens:
 - Normal mouse cursor will display over the brush preview
 - Brush won't paint
 - Brush gets frozen in place on the canvas while mouse cursor keeps moving
 - Canvas becomes unresponsive while the rest of the interface still works



Krita
  Version: 4.2.0-pre-alpha (git c5b490f)

Qt
  Version (compiled): 5.12.0
  Version (loaded): 5.12.0

OS Information
  Build ABI: x86_64-little_endian-lp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: linux
  Kernel Version: 4.20.6-arch1-1-ARCH
  Pretty Productname: Arch Linux
  Product Type: arch
  Product Version: unknown


OpenGL Info 
  Vendor:  NVIDIA Corporation 
  Renderer:  "GeForce GTX 750 Ti/PCIe/SSE2" 
  Version:  "4.6.0 NVIDIA 415.27" 
  Shading language:  4.60 NVIDIA 
  Requested format:  QSurfaceFormat(version 3.0, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1,
stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer,
swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::CompatibilityProfile) 
  Current format:    QSurfaceFormat(version 4.6, options
QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24,
redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 0,
stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer,
swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile 
QSurfaceFormat::CompatibilityProfile) 
     Version: 4.6
     Supports deprecated functions true 
     is OpenGL ES: false 

Hardware Information
 Memory: 15 Gb
 Cores: 8
 Swap: /tmp

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