This code is somewhat tricky. nsCaret::ComputeCaretRects was checking to see
if we have a bidi keyboard, and if so, what direction it's set to.
If the direction changed from the last direction seen for *this caret*,
we fired a SelectionLanguageChange notification on the caret's current
Selection. This looked bogus because the caret can be switched between
selections so it would seem some selections won't get a notification when
they should, but that's how it was. Also, when the SelectionLanguageChange
notification fired we then didn't draw the caret in that iteration, which
seems even more bogus.
This patch fixes all that by moving the logic to fire SelectionLanguageChange
out to GetPaintGeometry and firing the notification every single time without
trying to detect whether the state has changed or not. I carefully examined
the implementation of SelectionLanguageChange and I'm pretty sure it's
idempotent so this should be correct. That doesn't look like an
expensive function, and runs at most once per window paint, so I'm not
worried about perf. Because we now fire SelectionLanguageChange before
reading selection or frame state, it should be fine to carry on after
calling SelectionLanguageChange and drawing the caret based on whatever
changes SelectionLanguageChange has performed.
This also lets us remove mKeyboardRTL, which as noted above seems inherently
bogus.
--HG--
extra : rebase_source : 3ddfd10f6f30033e090e72b4bb43f2695218752e
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39217b370a