deprecate wxTR_EXTENDED and remove it from the docs

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44964 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/treectrl.tex

@@ -65,8 +65,6 @@ to be deselected.  This is the default.}
 \twocolitem{\windowstyle{wxTR\_MULTIPLE}}{Use this style
 to allow a range of items to be selected.
 If a second range is selected, the current range, if any, is deselected.}
-\twocolitem{\windowstyle{wxTR\_EXTENDED}}{Use this style
-to allow disjoint items to be selected.  (Only partially implemented; may not work in all cases.)}
 \twocolitem{\windowstyle{wxTR\_DEFAULT\_STYLE}}{The set of flags that are
 closest to the defaults for the native control for a particular toolkit.}
 \end{twocollist}

include/wx/treebase.h

@@ -162,7 +162,11 @@ enum wxTreeItemIcon
 
 #define wxTR_SINGLE                  0x0000     // for convenience
 #define wxTR_MULTIPLE                0x0020     // can select multiple items
-#define wxTR_EXTENDED                0x0040     // TODO: allow extended selection
+
+#if WXWIN_COMPATIBILITY_2_8
+    #define wxTR_EXTENDED            0x0040     // deprecated, don't use
+#endif // WXWIN_COMPATIBILITY_2_8
+
 #define wxTR_HAS_VARIABLE_ROW_HEIGHT 0x0080     // what it says
 
 #define wxTR_EDIT_LABELS             0x0200     // can edit item labels