The composition docker would be even better if it:
* would save the collapsed state of group layers (see also bug https://bugs.kde.org/show_bug.cgi?id=275899_
* save the lock state of layers
* have buttons to move forward and backwards through the saved compositions
* maybe have short preview, a snapshot of the image when the composition is created and later when it was visited.
*** This bug has been marked as a duplicate of bug 322159 ***