fix releasing mouse capture before showing modal dialog, see #16647

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78147 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/msgdlg.cpp

@@ -277,12 +277,6 @@ int wxMessageDialog::ShowModal()
 {
     WX_HOOK_MODAL_DIALOG();
 
-    // break the mouse capture as it would interfere with modal dialog (see
-    // wxDialog::ShowModal)
-    wxWindow * const win = wxWindow::GetCapture();
-    if ( win )
-        win->GTKReleaseMouseAndNotify();
-
     if ( !m_widget )
     {
         GTKCreateMsgDialog();
@@ -290,6 +284,10 @@ int wxMessageDialog::ShowModal()
                      wxT("failed to create GtkMessageDialog") );
     }
 
+    // break the mouse capture as it would interfere with modal dialog (see
+    // wxDialog::ShowModal)
+    GTKReleaseMouseAndNotify();
+
     // This should be necessary, but otherwise the
     // parent TLW will disappear..
     if (m_parent)