Commits on Apr 13, 2020

1. Bug 1628901 - Fix panic caused by calling BeginDraw with empty dirty … …

   …rect. r=sotaro
   
   Previously, it was possible for a tile that had a valid scroll root
   to have an empty valid (and dirty) rect due to the picture cache
   clip rect, in some situations.
   
   This could result in the tile not being tagged as off-screen, which
   means it is added to the queue of tiles to be updated. On most
   platforms this is benign, but the BeginDraw method of DirectComposition
   fails if the dirty rect is empty.
   
   This patch fixes the logic so that tiles that meet these conditions
   are correctly tagged as not visible, and skipped from update queue.
   
   Differential Revision: https://phabricator.services.mozilla.com/D70616
   
   [ghsync] From https://hg.mozilla.org/mozilla-central/rev/73632227ba00df584e8f6fcc1191e6dfa13fc5fd

   

   gw3583 authored and moz-gfx committed Apr 13, 2020

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