call Fit() when updating the message label to adapt to longer (or much shorter) labels

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57108 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/progdlgg.cpp

@@ -668,6 +668,8 @@ void wxProgressDialog::UpdateMessage(const wxString &newmsg)
     {
         m_msg->SetLabel(newmsg);
 
+        Fit();   // adapt to the new label size
+
         wxYieldIfNeeded() ;
     }
 }