moved *IsSpannedInto and *HasSpanningCells into cellmap, giving us the oppurtunity
to easily cache results if we want. These methods are still accessed through nsTableFrame.
changed nsTableFrame::GetCellAt to nsTableFrame::GetCellFrameAt to make it more clear what
the method returns: a frame, not content.
cells with colspans and specified widths divide their width provisionally between the columns they span. This provisional division is ammended by any cell in any of the effected columns that:
1) has a colspan=1, and
2) has a width specified
the widths of all other columns must be adjusted for cells like these. Further complicating matters is that it seems <faith> that if multiple colspanning cells intersect a column and each has a width
specified such that the column would have a different width depending on which is used, only the first such cell is used </faith>. I can neither confirm nor deny this reading the mozilla code.
I also taught the cell map how to deal with this situation:
colspan=1 | colspan=2 | colspan=1
colspan=1 | colspan=2 | colspan=1
This table "really" has 4 columns, but the middle cells are treated as if they have no colspan.
Trust me, it matters. The original colspan attributes can't simply be thrown away because Mr. DOM
could come along at any time and add/remove a cell that would make them important.
for nonsense COLSPANs at the edge of a table. Fixed some bugs this uncovered
where the cell was being asked for its colspan attribute rather than the table
being asked for the cell's effective col span.
this work exposed a few bugs and slow spots, which have been fixed
for the aol page, I added some additional backwards compatibility code
to proportionately distribute width when a fixed-width cell has colspans
1. cellmap couldn't properly delete CellData because definition was unavailable
2. optimized table cells made taller wouldn't shrink when they should because we were not
remembering the previous desired height of the cell.
3. rows were placing cells on the left edge, and not adding in the left margin.
