Using the contentItem of a ToolButton as the reference geometry and source for a ColorOverlay no longer works in 5.10.1 (this is a regression from 5.10.0).
Running the attached QML works as expected in 5.10.0 but not in 5.10.1 (see attached screen shots for both runs. Both images should have a gray overlay).
Assigning an id to the contentItem and using that as a reference for the ColorOverlay works in both versions so it is a (partial) workaround.
However, since the geometry of the contentItem doesn't seem to get calculated properly, the ToolButton highlight has the wrong geometry in 5.10.1.