treeview: Draw rubber band rectangle more often
If the cursor coordinates are outside of the content (the GtkRBTree), gtk_tree_view_bin_draw() will return and not draw the rubber band rectangle.
Fixes #1859 (closed)
If the cursor coordinates are outside of the content (the GtkRBTree), gtk_tree_view_bin_draw() will return and not draw the rubber band rectangle.
Fixes #1859 (closed)