Robert O'Callahan ac58488971 Bug 637852. Part 22: Detect when the contents of a ThebesLayer have shifted by a subpixel amount and repaint the entire layer when that happens. r=tnikkel ...

This fixes artifacts when we're scrolling inside scaled content, and includes a test for that (which fails without
this code change).

2011-06-23 00:11:28 +12:00

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