Patch forthcoming
Created attachment 11548 [details] Replace manual test with automatic repaint test I verified that the automated test fails on r17823 (prior to the fix). For what it's worth, I couldn't reproduce the bug with the manual test at first, and I had to give the editable div a fixed height in order to be able to reproduce manually.
Comment on attachment 11548 [details] Replace manual test with automatic repaint test r=me
Committed revision 17852.