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Created by Kitware Robot@kwrobotOwner

vtkRenderer backing store breaks when window unexposed

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

Steps to reproduce:

  1. Open the attached VTK program (or any other VTK program: just modify it by calling BackingStoreOn() on a renderer).
  2. Set any other window to be "always on top".
  3. Move the other window so that it half-covers the VTK window.
  4. Manipulate the camera in the VTK window, while the other window covers half of it.
  5. Move the other window away.

Expected results: the image in the VTK window is identical to what it would have been if the other window hadn't been there.

Actual results: the part of the VTK window which was underneath the other window has the "old" image -- that is, exactly the contents which it had before it was covered by the other window.

This is an extreme annoyance in, say, a program with a large render area which uses dialogs: the dialogs create these glitches very often.