FLEX-35267FLEX-35260FLEX-35029 1. GridHeaderViewLayout.getHeaderIndexAt() now verifies if the coordinates are over the GridColumnHeaderView's left or right padding. 2. Renamed GridColumnHeaderGroup.mouseEventHeaderView() to getHeaderViewUnderGlobalCoordinates(), while also changing the parameter to be a Point instead of a MouseEvent. This is so that areCoordinatesOverAHeaderView(), areCoordinatesOverLeftPadding() and areCoordinatesOverRightPadding() can use it too. 3. Expanded some variable names in GridColumnHeaderGroup.
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