This commit broke the clone brush:
https://bugs.kde.org/show_bug.cgi?id=361577
commit 00d78c05af9c4fd9081431c0177db465d934119a
Author: Dmitry Kazakov <dimula73@gmail.com>
Date: Tue Mar 29 16:27:10 2016 +0300
Added a hack that keeps a KisBrush object available during painting This fixes brush outline while painting Fixes T1975