When overriding the FL_Tree_Item::draw_item_contents() method, the expectation (at least from my perspective) is that the returned value would be upheld in future computations. In particular, I expected the assigned widget to be placed at some offset from this value. However: the placement of the widget is independently computed on line 1083, against the label's width; and, while the result of draw_item_contents() is stored in xmax on line 1138, it is overwritten on line 1146, as long as a widget is set. This means that the result of draw_item_contents() is completely ignored as long as the FL_Tree_Item has an assigned widget. I'm not sure if this is the intended behavior, but it seems somewhat incoherent and counter-intuitive.

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