Add "rect" paramerer to wxRichToolTip::ShowFor().

Allow to show the tooltip at the exact specified position instead of placing
it automatically.

Closes #14862.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73050 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/richtooltip.h

@@ -87,8 +87,8 @@ public:
     // or colour appropriate for the current platform.
     void SetTitleFont(const wxFont& font);
 
-    // Show the tooltip for the given window.
-    void ShowFor(wxWindow* win);
+    // Show the tooltip for the given window and optionally a specified area.
+    void ShowFor(wxWindow* win, wxRect* rect = NULL);
 
     // Non-virtual dtor as this class is not supposed to be derived from.
     ~wxRichToolTip();