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Kristian Rietveld authored
Initialize event_last_[xy] to out of range coordinates and also update these values in enter and leave notify. Fix up calls to update_prelight() from size allocate. Unconditionally doing these calls caused problems with hover selection. Now we only do this call when the "width before the expander column" has changed. (Which might be awkward, but it is the best heuristic I could come up with so far).
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