1. Open kolourpaint 2. Select transparent colour as foreground 3. Try to make a transparent circle or line or square or whatever It does nothing. It seems transparent works only with the fill tool and with the cut tool Seems the issue has been present for a while because there's a bugreport from 2019 on debian about this.
Hi - merging this in with an existing bug report for this issue. Thanks! *** This bug has been marked as a duplicate of bug 266883 ***