def fetchResults(self, string, context, feedback):
        # collect results in main thread, since this method is inexpensive and
        # accessing the processing registry/current layer is not thread safe

        if iface.activeLayer() is None or iface.activeLayer().type() != QgsMapLayer.VectorLayer or not iface.activeLayer().selectedFeatureCount():
            return

        for a in QgsApplication.processingRegistry().algorithms():
            if not a.flags() & QgsProcessingAlgorithm.FlagSupportsInPlaceEdits:
                continue

            if not a.supportInPlaceEdit(iface.activeLayer()):
                continue

            if QgsLocatorFilter.stringMatches(a.displayName(), string) or [t for t in a.tags() if QgsLocatorFilter.stringMatches(t, string)] or \
                    (context.usingPrefix and not string):
                result = QgsLocatorResult()
                result.filter = self
                result.displayString = a.displayName()
                result.icon = a.icon()
                result.userData = a.id()
                if string and QgsLocatorFilter.stringMatches(a.displayName(), string):
                    result.score = float(len(string)) / len(a.displayName())
                else:
                    result.score = 0
                self.resultFetched.emit(result)

    def fetchResults(self, string, context, feedback):
        # collect results in main thread, since this method is inexpensive and
        # accessing the processing registry is not thread safe
        for a in QgsApplication.processingRegistry().algorithms():
            if a.flags() & QgsProcessingAlgorithm.FlagHideFromToolbox:
                continue

            if QgsLocatorFilter.stringMatches(a.displayName(), string) or [t for t in a.tags() if QgsLocatorFilter.stringMatches(t, string)]:
                result = QgsLocatorResult()
                result.filter = self
                result.displayString = a.displayName()
                result.icon = a.icon()
                result.userData = a.id()
                if string and QgsLocatorFilter.stringMatches(a.displayName(), string):
                    result.score = float(len(string)) / len(a.displayName())
                else:
                    result.score = 0
                self.resultFetched.emit(result)

    def fetchResults(self, string, context, feedback):
        for a in QgsApplication.processingRegistry().algorithms():
            if feedback.isCanceled():
                return
            if a.flags() & QgsProcessingAlgorithm.FlagHideFromToolbox:
                continue

            if QgsLocatorFilter.stringMatches(a.displayName(), string) or [t for t in a.tags() if QgsLocatorFilter.stringMatches(t, string)]:
                result = QgsLocatorResult()
                result.filter = self
                result.displayString = a.displayName()
                result.icon = a.icon()
                result.userData = a.id()
                if string and QgsLocatorFilter.stringMatches(a.displayName(), string):
                    result.score = float(len(string)) / len(a.displayName())
                else:
                    result.score = 0
                self.resultFetched.emit(result)

 def testStringMatches(self):
     self.assertFalse(QgsLocatorFilter.stringMatches('xxx', 'yyyy'))
     self.assertTrue(QgsLocatorFilter.stringMatches('axxxy', 'xxx'))
     self.assertTrue(QgsLocatorFilter.stringMatches('aXXXXy', 'xxx'))
     self.assertFalse(QgsLocatorFilter.stringMatches('aXXXXy', ''))