[LOW] STR #3528: Fl_Tree: dragging an item over a widget() can cause FL_RELEASE to be ignored

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[LOW] STR #3528: Fl_Tree: dragging an item over a widget() can cause FL_RELEASE to be ignored Greg Ercolano Aug 27, 2019 top right image
 
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[STR New]

Link: https://www.fltk.org/str.php?L3528
Version: 1.4-current


To replicate:

   1. Run test/tree
   2. Change "Selection Mode:" to Single+Drag
   3. Drag 'Ddd' up and over the "ccc button" and release mouse to drop

The drop is ignored.

FL_RELEASE is being sent to the tree's handle() method but it's being
ignored, probably because the release is inside the widget(). It should
be handled by the tree due an item being actively dragged.


Link: https://www.fltk.org/str.php?L3528
Version: 1.4-current


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