fixed GetItemSpacing() inconsistency by deprecating the old function and adding a new, easier to use, overload

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23576 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/listctrl.h

@@ -189,10 +189,8 @@ public:
     // Gets the number of columns in the list control
     int GetColumnCount() const { return m_colCount; }
 
-    // Retrieves the spacing between icons in pixels.
-    // If small is TRUE, gets the spacing for the small icon
-    // view, otherwise the large icon view.
-    int GetItemSpacing(bool isSmall) const;
+    // get the horizontal and vertical components of the item spacing
+    wxSize GetItemSpacing() const;
 
     // Foreground colour of an item.
     void SetItemTextColour( long item, const wxColour& col);
@@ -355,6 +353,10 @@ public:
     // Necessary for drawing hrules and vrules, if specified
     void OnPaint(wxPaintEvent& event);
 
+
+    // obsolete stuff, for compatibility only -- don't use
+    wxDEPRECATED( int GetItemSpacing(bool isSmall) const);
+
 protected:
     // common part of all ctors
     void Init();