Fix thumb position determination in these places:
- nsSliderFrame::StartAPZDrag() -- Constrain sliderTrack using
GetXULClientRect() to match dimensions used in
SetCurrentThumbPosition() and DoXULLayout(). This is what caused
the scaling/offset mismatch.
- nsSliderFrame::StartAPZDrag() -- Adjust nonsensical calculation of
cssSliderTrack. Should be sliderFrame + scrollbarFramePosition -
compositionBoundsPosition, to get coordinates relative to the same
region as that of APZ event coordinates.
- AsyncDragMetrics -- Make mScrollTrack and mScrollbarDragOffset float
instead of int coordinates.
- AsyncPanZoomController::HandleDragEvent() -- Use
GetAxisLength(scrollTrack) instead of GetAxisEnd(scrollTrack) in
calculation of scrollMax.
- AsyncPanZoomController::HandleDragEvent() -- Only change position on
MOUSE_MOVE.
Additional refactors:
- Rename HitTestingTreeNode::GetScrollSize() to GetScrollThumbLength(),
along with related functions/variables.
- Rename AsyncPanZoomController::GetAxisSize() to GetAxisLength().
- Rename cf to scrollFrame in nsSliderFrame::StartAPZDrag().
MozReview-Commit-ID: CIsU8Pj6qfa
--HG--
extra : rebase_source : 29548fb95ec3e958d903d964753857ee949753ba
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