* app/core/gimpgrouplayer.[ch]: add gimp_group_layer_suspend_resize()
and gimp_group_layer_resume_resize() and call them around functions
where all a group's children are transformed (translated, resized
etc). This way we go from the worst case of reallocating the
group's projection tiles once for each child down to exactly one
reallocation.
* app/core/Makefile.am
* app/core/core-enums.[ch]
* app/core/core-types.h
* app/core/gimpimage-undo-push.[ch]
* app/core/gimpgrouplayerundo.[ch]: add new undo class
GimpGroupLayerUndo which implements undos for suspend/resume of
group layers and calls them in reverse order when undoing.
Insert a gegl:translate node into the group layer's projection
graph. Produces identical results as the legacy projection now, but is
not yet switched on by checking View->Use Gegl.
Implement the GimpProjectable interface and keep a GimpProjection
around that projects the GimpDrawableStack of our children. Propagate
the childrens' "update" signals to our own "update" signal so our
parent projection picks up all changes.
Michael Natterer