So the coordinates seem to have come off by one pixel in the X and Y direction, but the size did not change. Making the globalRect comparison less strict (or even implementing a "second try" strategy in the comparison) might work, although it is no pretty solution.
Thanks for the help so far on IRC.
Here's what I have found so far:
GtkTreeView's globalRect: 225,270,122,242 ssible' s globalRect: 224,269,122,242
GtkTreeViewAcce
So the coordinates seem to have come off by one pixel in the X and Y direction, but the size did not change. Making the globalRect comparison less strict (or even implementing a "second try" strategy in the comparison) might work, although it is no pretty solution.