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QgsEditorWidgetRegistry disconnect signals when mapLayer will be remo…
…ved (#3186) Add a method to disconnect signals added when layerIsAdded to QgsMapLayerRegistry. This method is connect to layerWillBeRemoved. This method will probably fix an issue in QGIS Server about performance deterioration. Each time a layer is added to QgsMapLayerRegistry by QGIS Server, QgsEditorWidgetRegistry connects to appropriate signals from map layers to load and save style but NEVER disconnects its.
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