Ting-Yu Lin e84cf763d7 Bug 1273045 Part 2 - Update carets when scrolling in subframes without APZ. r=mtseng ...

Override OnScrollPositionChanged() in ScrollState because we want to update
carets during scrolling in subframes without APZ.

Due to the observation in bug 1273045 comment 8, we do not distinguish
PositionChangedResult::NotChanged and PositionChangedResult::Changed.
Instead, we always update caret even if its position is not changed.

To avoid excessive CaretStateChangedEvents are dispatched in
OnScrollPositionChanged(), we add IsScrollStarted to distinguish whether
OnScrollStart() is called or not.

MozReview-Commit-ID: KNi9Mct4dSk

2017-03-14 17:50:03 +08:00

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