SUMMARY
When you draw, after some times, change you made (changing Hue/sat/Va, or layer for instance) show only if you put the mouse over the image screen. 
So if you uncheck a visibility layer icon on the layer window, you will not see the change unless you put the mouse diretly on the screeN 

STEPS TO REPRODUCE
1. Draw for a moment (it never appears directly to me, but always after 30mn
2. openthe layer panel. Uncheck visibiluty of a layer, eep the mouse on the layer panel
3. 

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION