Shortcut for Resizing Brush

[cameronwhite]

Discussed in #794

^{Originally posted by steveman1123 May 5, 2024}
I am using v2.1.2

I find the workflow to resize brush very clunky (having to move the cursor off the image, click a bunch of times, then go back to the image to see if the brush is the right size).

I'd like to see a keyboard shortcut like Paint.NET where "[" and "]" decrease/increase respectively.