Since I updated some frameworks repositories from master, I can no longer start kolourpaint. It says: kolourpaint: symbol lookup error: kolourpaint: undefined symbol: _ZN13KSelectAction14indexTriggeredEi This is an ABI break, which needs to be postponed to the KF6 version.
On a second look, I updated kolourpaint that was built against the newest frameworks version, but didn't update the kwidgetsaddons framework yet.