Rename wxGrid::GetSelectionRange() to GetSelectedBlocks()

This seems to be more consistent with the existing functions and doesn't
create ambiguity with a grid range.

Also rename wxGridSelectionRange to just wxGridBlocks as, in principle,
this class could be used for iterating over any blocks, not just the
selected ones.

No changes in functionality, this is just a renaming.

include/wx/generic/grid.h

@@ -876,10 +876,10 @@ struct wxGridBlockDiffResult
 };
 
 // ----------------------------------------------------------------------------
-// wxGridSelectionRange: a range of grid blocks that can be iterated over
+// wxGridBlocks: a range of grid blocks that can be iterated over
 // ----------------------------------------------------------------------------
 
-class wxGridSelectionRange
+class wxGridBlocks
 {
     typedef wxVector<wxGridBlockCoords>::const_iterator iterator_impl;
 
@@ -913,7 +913,7 @@ public:
 
         iterator_impl m_it;
 
-        friend class wxGridSelectionRange;
+        friend class wxGridBlocks;
     };
 
     iterator begin() const
@@ -927,13 +927,13 @@ public:
     }
 
 private:
-    wxGridSelectionRange() :
+    wxGridBlocks() :
         m_begin(),
         m_end()
     {
     }
 
-    wxGridSelectionRange(iterator_impl begin, iterator_impl end) :
+    wxGridBlocks(iterator_impl begin, iterator_impl end) :
         m_begin(begin),
         m_end(end)
     {
@@ -1994,7 +1994,7 @@ public:
     bool IsInSelection( const wxGridCellCoords& coords ) const
         { return IsInSelection( coords.GetRow(), coords.GetCol() ); }
 
-    wxGridSelectionRange GetSelectionRange() const;
+    wxGridBlocks GetSelectedBlocks() const;
     wxGridCellCoordsArray GetSelectedCells() const;
     wxGridCellCoordsArray GetSelectionBlockTopLeft() const;
     wxGridCellCoordsArray GetSelectionBlockBottomRight() const;