SUMMARY
The keys "[" and "]" usually modify the brush size. This, however, does not happen when using the "Line" tool

STEPS TO REPRODUCE
1. Select a brush and the Line tool. Draw a line
2. Use the "[" or "]" key to increase or decrease the brush size. 
3. No change in brush size is registered on the toolbar or applied to the brush.

OBSERVED RESULT No change to brush size.


EXPECTED RESULT


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

ADDITIONAL INFORMATION