Edit the current wxGrid selection block

Really edit the current selection block instead of storing the temporary
information about the current selection and applying it on releasing Shift
key or LKM.

include/wx/generic/grid.h

@@ -2508,16 +2508,6 @@ protected:
         { return SetCurrentCell( wxGridCellCoords(row, col) ); }
 
 
-    // this function is called to extend the block being currently selected
-    // from mouse and keyboard event handlers
-    void UpdateBlockBeingSelected(int blockStartRow, int blockStartCol,
-                                  int blockEndRow, int blockEndCol);
-
-    void UpdateBlockBeingSelected(const wxGridCellCoords& blockStart,
-                                  const wxGridCellCoords& blockEnd)
-        { UpdateBlockBeingSelected(blockStart.GetRow(), blockStart.GetCol(),
-                                   blockEnd.GetRow(), blockEnd.GetCol()); }
-
     virtual bool ShouldScrollToChildOnFocus(wxWindow* WXUNUSED(win)) wxOVERRIDE
         { return false; }