FLEX-35280 FLEX-35260 Recent changes to FLEX-35267 made it so that the y value in GridHeaderViewLayout.getHeaderIndexAt() started to be considered, when before it was simply ignored. But one caller of this function, GridColumnHeaderGroup.eventToHeaderLocations(), simply used '0' for that argument, instead of the real value, knowing that (before these changes) it wasn't being considered. Now the real value is used.
FLEX-35260 Now the unit test passes, having been updated to check the column header view boundaries. Other changes: -Now we're ignoring the grid header's right padding, because it doesn't make a visual difference (except in the edge case where, together with the left and right padding, the column widths are wider than the grid's width, in which case the grid header expands beyond the grid limits), but we are starting to take into account bottom and top padding. -Renamed some variables and functions for clarity in GridColumnHeaderView and GridDimensions. -Improved error messages in the unit test