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009562b403
The graphical bug happens when there is a frame disposed to background color, followed by another frame that does not blend, and their areas don't fully overlap. Only the previous frame clears its part of the viewport. The fix consists in clearing the screen for the previous and the current frame if needed. Change-Id: I3425cf7297f0c7b2cf13a3a61b517cc0b1c031d8