The image artefacts is only when using the ToolButtons, I have created a workaround. This bug was found by Gilles Caulier. Reproducible: Sometimes
Created attachment 90135 [details] graphicsdimgview.patch
Git commit 7546960e6fcb8a0a88810dbe76eae14aa048137e by Gilles Caulier. Committed on 28/12/2014 at 12:04. Pushed by cgilles into branch 'master'. Apply patch #90135 from Maik Qualmann to fix zoom in/out artifact over editor canvas when zoom+/- buttons are used FIXED-IN: 4.7.0 M +2 -1 NEWS M +3 -1 libs/widgets/graphicsview/graphicsdimgview.cpp http://commits.kde.org/digikam/7546960e6fcb8a0a88810dbe76eae14aa048137e
Git commit 8a021f69da33edb82bf905cf32093331c63906f2 by Gilles Caulier. Committed on 28/12/2014 at 12:07. Pushed by cgilles into branch 'frameworks'. backport commit #7546960e6fcb8a0a88810dbe76eae14aa048137e from git/master M +2 -0 libs/widgets/graphicsview/graphicsdimgview.cpp http://commits.kde.org/digikam/8a021f69da33edb82bf905cf32093331c63906f2