D18376: Fix software cursors with drm backend

davidedmundson added a comment.


  > Instead of emitting cursorChanged from DrmBackend, modify SceneOpenGL to connect Platform::cursorChanged as opposed to Cursor::cursorChanged to the cursor texture update function.
  
  Where does the platform emit cursorChanged? 
  On wayland the only place I can see that emits Platform::cursorChanged is connected to CursorImage::changed
  
  The rest of the changes look sensible.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D18376

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