When we reset the dirty rect to PictureRect::zero() on a Tile, we must also mark the Tile as valid. This prevents the propagation of zero-area, rectangles which can otherwise ultimately cause BeginDraw failures.
Bug 1893205 Comment 16 Edit History
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When we reset the dirty rect to PictureRect::zero() on a Tile, we must also mark the Tile as valid. This prevents the propagation of zero-area rectangles which can otherwise ultimately cause BeginDraw failures.