From Bertrand:

- fixed SegV when running Spy.C and closing its window via the
  Window Manager;
- re-implemented the old behavior of a TGListBox with
  SetMultipleSelections(kTRUE): it is possible again to
  select several items by selecting the first one and
  moving the mouse while the mouse button is still pressed
  (thanks to Reiner Rohlfs).


git-svn-id: http://root.cern.ch/svn/root/trunk@13872 27541ba8-7e3a-0410-8455-c3a389f83636