Change the brush size quickly.
GIMP now uses the [ and ] keys to change the brush size, but the zoom is slow.
Or drag the size slider on the tool options dialog-box, but you can't see the real-time changes in the brush outline.
Description of the feature
Change the brush size quickly.
Krita and AzPainter both use Shift+Left Drag to quickly change the brush size, but the Shift key of GIMP has been occupied.
I think this function can be done with a custom key.
Just like the "drag rod" of the filter, quickly work on the canvas.