added wxTextEntry::SetHint() (a.k.a. cue banner or placeholder string)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59263 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/srchctrl.h

@@ -64,6 +64,10 @@ public:
 
     virtual void ShowCancelButton( bool show ) = 0;
     virtual bool IsCancelButtonVisible() const = 0;
+
+private:
+    // implement wxTextEntry pure virtual method
+    virtual wxWindow *GetEditableWindow() { return this; }
 };