xdg: add missing tracking of configure serials #2788
                
     Merged
            
            
          
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In some cases, we would schedule a configure event but not record that we had done so, leaving
view->pending_configure_serialincorrect. This caused incorrect handling of in-flight commits that had not yet taken the new configure into account, such as assuming that the client had ignored the configured size and incorrectly resettingview->pending.Fixes: #2774