Whenever I try to scale the size of the Smart Patch Tool brush it does nothing. Though if I change the size of my painting Brush and switch back to the Smart Patch Tool then that does the trick and the brush is scaled. I tries my Wacom Intuos stylus but this didn't fix it; pressure sensitivity doesn't work with this brush. Neither did Shift+Drag. I brought this issue up on a Krita chatroom and I was directed to this website to report it.
Can confirm in master :)
(Can confirm on Ubuntu 14.04 - Krita 4.0.0-beta1.1.appimage, as well)
Can confirm still present in v4.0.0.51-350 on Windows 10 x64
I can confirm the bug. More than that: pressing F5 opens **locked** brush editor and changing anything there makes Krita go crazy.
Occurs for me on 4.2.7.1 on Win10 x64...
(Still, It seems) occurs for me on 4.2.7.1 on Win10 x64...
*** Bug 384110 has been marked as a duplicate of this bug. ***