Ensure that color picker cannot select transparent color
Ensure that color picker cannot select transparent color

Erase mode should be used by the user instead.

merripho/goya,jackschaedler/goya,adamaveray/goya,sparxHub/goya,sparxHub/goya,crysislinux/goya,merripho/goya,crysislinux/goya,adamaveray/goya