The source project of this merge request has been removed.
app: Fix "Handle Transform" handle snap location
While the GimpToolTransformGrid properly sets the snap offset for its handles, GimpToolHandleGrid (used for the Handle Transform tool) did not. This commit fixes that, essentially just adapting the logic from GimpToolTransformGrid.
Fixes #9014 (closed) for the Gimp 2.10 branch. This will also have to be ported to the 2.99.x branch.