Steps to reproduce: 1. Type any single character with Kotoeri. 2. Press backspace. Results: insertion point disappears; further keypresses have no effect.
Actually, I'm seeing the insertion point disappear all the time when typing with RuSwitcher, even when not using Backspace. I'm not opening a new bug as I hope that the root cause is the same. Makes typing really hard for me :(
This was apparently introduced in r27009 with a fix for rdar://problem/5544856 and (incidentally) bug 15702.
<rdar://problem/5576619>
Investigating...
I have a fix, TypingCommand::deleteSelection needs to call typingAddedToOpenCommand(), which will take the command's endingSelection and set it as selection. Working on a layout test.
Fixed in <http://trac.webkit.org/projects/webkit/changeset/27488>.