Sometimes the Test area gets confused when you press multiple mouse (or tablet) buttons at once and stops drawing anything until your restart kitra.




Reproducible: Always

Steps to Reproduce:
Reproduction with a mouse:

1. Create new document, Open Brush settings.
2. Start Drawing into the test area with left click
3. While still holding left click, press the right mouse button.

Actual Results:  
Notice that you can't draw in the test area any more. Nothing short of restarting Krita will fix it.

Expected Results:  
Not having to restart Krita every time I hit the wrong button on my stylus. 

I've managed to reproduce this on both Windows 10 and Linux on both Krita 3.0 and 3.0.1 alpha with some mixed results, like either middle clicking and right clicking while holding left mouse will lock it on Linux. But on windows only right click triggers it when using the mouse and only middle click triggers it when using a drawing tablet (I have a Wacom PTZ-630)

I'm pretty sure that the same bug (or a closely related one) exists in the main canvas too, but I haven't managed to reliably reproduce it: only sporadically on windows and only with a tablet (and it fixes itself when you switch brushes).