Make wxGrid column selecting more user friendly

interface/wx/grid.h

@@ -4830,6 +4830,12 @@ public:
     */
     void MakeCellVisible(const wxGridCellCoords& coords);
 
+    /**
+        Returns the topmost row of the current visible area.
+        Returns -1 if the grid doesn't have any rows.
+    */
+    int GetFirstFullyVisibleRow() const;
+
     /**
         Sets the number of pixels per horizontal scroll increment.