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Kristian Rietveld authored
Store (x, y) of last motion event. From gtk_tree_view_adjustment_changed(), call prelight_or_select() so that the prelight is recalculated. We do the same from gtk_tree_view_size_allocate() for the case that clicking on an expander shows new rows that resize the column(s) left of the expander. This means that the expander is moved horizontally, in such a case the prelight also has to be reconsidered.
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