Chris Lord 13bc605c08 Bug 803013 - Maintain coherency when progressively updating visible areas. r=bgirard
When rendering progressively, make sure that any previously visible area that
is still visible is updated at the same time. This helps maintain visual
coherency on pages that invalidate previously visible areas while scrolling,
and when losing layers between updates.

This supersedes the previous method of only doing progressive updates while
scrolling.
2012-10-22 20:18:14 +01:00
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