SUMMARY While using the Line Tool, keyboard sortcuts (square brackets in my case), or otherwise using Shift+Click and dragging doesn't change the brush size. STEPS TO REPRODUCE 1. Select the Line Tool 2. Use square brackets to change brush size or Shift+Click OBSERVED RESULT Brush size does not change. EXPECTED RESULT Brush size should change. SOFTWARE/OS VERSIONS Windows: Windows 10 Pro, Version 1903 macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
*** This bug has been marked as a duplicate of bug 412096 ***