- Main change is the addition of wxGridSelectRowsOrColumns selection mode

(which is still probably buggy, wxGridSelection needs to be reviewed)
- Add XYToCell() overloads returning wxGridCellCoords (instead of modifying the
  argument passed by reference -- where did this come from?) and document them.
- Added GoToCell() which does make the new current cell visible unlike
  SetGridCursor() (which was documented as doing it, but wasn't)
- Changed SetCurrentCell() to only not change the cell if wxEVT_GRID_SELECT_CELL
  it generates is vetoed, not just processed as this seems to make more sense
- Split jumbo (~400 lines) ProcessGridCellMouseEvent() function into chunks
- Add many more comments to make reading this code seem less like puzzle
  solving for the next unfortunate soul to do it


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55746 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -392,6 +392,7 @@ All (GUI):
 - wxWindow::IsBeingDeleted() now returns true not only if the window itself is
   marked for destruction but also if any of its parent windows are.
 - Improved drawing of the hint during column move in wxGrid.
+- Add wxGridSelectRowsOrColumns selection mode to wxGrid.
 - Get/HasModifiers() of wxKeyEvent are now also available in wxMouseEvent.
 
 wxGTK: