D28630: [xwl] Fix crash if same data is requested twice

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REVISION SUMMARY
  m_dataRequests is a list of transfers for a given selection.
  It exists primarily as a ref counting mechanism that matches up
  transfers with selections.
  
  If the same data is requested twice we would insert two items into the
  list with matching timestamps for the original selection. This then
  confuses the callback handling.
  
  BUG: 417936

TEST PLAN
  kwin_wayland + chromium
  drag and drop a URL onto desktopview. kwin used to crash here
  Now a context menu now appears and I can add a link

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28630

AFFECTED FILES
  xwl/drag_x.cpp

To: davidedmundson, #kwin
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