Add simple wxGrid::GetGridCursorCoords() method

This is sometimes more convenient than using GetGridCursor{Row,Col}()
separately.

include/wx/generic/grid.h

@@ -1179,6 +1179,9 @@ public:
     wxRect CellToRect( const wxGridCellCoords& coords ) const
         { return CellToRect( coords.GetRow(), coords.GetCol() ); }
 
+    const wxGridCellCoords& GetGridCursorCoords() const
+        { return m_currentCellCoords; }
+
     int  GetGridCursorRow() const { return m_currentCellCoords.GetRow(); }
     int  GetGridCursorCol() const { return m_currentCellCoords.GetCol(); }
 

interface/wx/grid.h

@@ -3827,13 +3827,28 @@ public:
     */
     //@{
 
+    /**
+        Returns the current grid cursor position.
+
+        If grid cursor doesn't have any valid position (e.g. if the grid is
+        completely empty and doesn't have any rows or columns), returns
+        @c wxGridNoCellCoords which has both row and columns set to @c -1.
+
+        @since 3.1.3
+     */
+    const wxGridCellCoords& GetGridCursorCoords() const;
+
     /**
         Returns the current grid cell column position.
+
+        @see GetGridCursorCoords()
     */
     int GetGridCursorCol() const;
 
     /**
         Returns the current grid cell row position.
+
+        @see GetGridCursorCoords()
     */
     int GetGridCursorRow() const;