Created attachment 86123 [details]
Path to brush setting
I was having trouble figuring out why the blending mode for the brush wasn't changing while I was trying to change it from within the brush settings. Turns out you have to double click the name of the blending mode.
In other places where we select blending modes, a single click is all that's needed since they're just dropdown menus. I think we should have a single click to select the blending mode in the brush settings.
This is probably because the wrong signal is used. There's "activated" which depending on the desktop/KDE setting is single or double click.
I'd say, check kis_compositeop_option.cpp for SIGNAL(activated()) and fix the bug :P