Recompute the tooltip width when changing its text in wxMSW.

This avoids unnecessarily wrapping the tooltips if they are set to a longer
string than their initial value later.

Closes #4685.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75756 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/tooltip.h

@@ -94,6 +94,9 @@ private:
     // remove this tooltip from the tooltip control
     void Remove();
 
+    // adjust tooltip max width based on current tooltip text
+    bool AdjustMaxWidth();
+
     wxString  m_text;           // tooltip text
     wxWindow* m_window;         // main window we're associated with
     wxToolTipOtherWindows *m_others; // other windows associated with it or NULL