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Improve QgsVectorLayer::countSymbolFeatures() responsiveness.
The method can display a progress dialog when it takes a long time to complete. - Attach this dialog to the QGIS main window. - Use the interruption checker mechanism of iterators so that the to-be-committed improved WFS feature iterator can use it - Call QCoreApplication::processEvents() for better UI responsiveness.
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@rouault , I think this led to the regression described here: http://hub.qgis.org/issues/16149