Provide a standard string comparison method in QgsLocatorFilter

Subclasses should use this method instead of directly calling
QString::contains or using Python 's in search' type matches.
This ensures consistent matching behaviour across different filters.

Author: nyalldawson

python/gui/locator/qgslocatorfilter.sip

@@ -52,7 +52,7 @@ class QgsLocatorResult
  Icon for result.
 %End
 
-    double score = 0.5;
+    double score;
 %Docstring
  Match score, from 0 - 1, where 1 represents a perfect match.
 %End
@@ -159,6 +159,15 @@ class QgsLocatorFilter : QObject
 .. seealso:: useWithoutPrefix()
 %End
 
+    static bool stringMatches( const QString &candidate, const QString &search );
+%Docstring
+ Tests a ``candidate`` string to see if it should be considered a match for
+ a specified ``search`` string.
+ Filter subclasses should use this method when comparing strings instead
+ of directly using QString.contains() or Python 'in' checks.
+ :rtype: bool
+%End
+
   signals:
 
     void resultFetched( const QgsLocatorResult &result );

python/plugins/processing/gui/AlgorithmLocatorFilter.py

@@ -58,13 +58,13 @@ def fetchResults(self,string,context,feedback):
             if a.flags() & QgsProcessingAlgorithm.FlagHideFromToolbox:
                 continue
 
-            if string.lower() in a.displayName().lower() or [t for t in a.tags() if string.lower() in t.lower()]:
+            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.lower() in a.displayName().lower():
+                if QgsLocatorFilter.stringMatches(a.displayName(),string):
                     result.score = float(len(string)) / len(a.displayName())
                 else:
                     result.score = 0

src/app/locator/qgsinbuiltlocatorfilters.cpp

@@ -40,7 +40,7 @@ void QgsLayerTreeLocatorFilter::fetchResults( const QString &string, const QgsLo
     if ( feedback->isCanceled() )
       return;
 
-    if ( layer->layer() && layer->layer()->name().contains( string, Qt::CaseInsensitive ) )
+    if ( layer->layer() && stringMatches( layer->layer()->name(), string ) )
     {
       QgsLocatorResult result;
       result.filter = this;
@@ -75,7 +75,7 @@ void QgsLayoutLocatorFilter::fetchResults( const QString &string, const QgsLocat
     if ( feedback->isCanceled() )
       return;
 
-    if ( composition && composition->name().contains( string, Qt::CaseInsensitive ) )
+    if ( composition && stringMatches( composition->name(), string ) )
     {
       QgsLocatorResult result;
       result.filter = this;
@@ -150,7 +150,7 @@ void QgsActionLocatorFilter::searchActions( const QString &string, QWidget *pare
 
     QString searchText = action->text();
     searchText.replace( '&', QString() );
-    if ( searchText.contains( string, Qt::CaseInsensitive ) )
+    if ( stringMatches( searchText, string ) )
     {
       QgsLocatorResult result;
       result.filter = this;

src/gui/locator/qgslocatorfilter.cpp

@@ -17,16 +17,17 @@
 
 
 #include "qgslocatorfilter.h"
+#include "qgsstringutils.h"
 
 QgsLocatorFilter::QgsLocatorFilter( QObject *parent )
   : QObject( parent )
 {
 
 }
 
-bool QgsLocatorFilter::stringMatches( const QString &test, const QString &match )
+bool QgsLocatorFilter::stringMatches( const QString &candidate, const QString &search )
 {
-  return QgsStringUtils::containsFuzzy( match, test );
+  return candidate.contains( search, Qt::CaseInsensitive );
 }
 
 bool QgsLocatorFilter::useWithoutPrefix() const

src/gui/locator/qgslocatorfilter.h

@@ -41,7 +41,10 @@ class GUI_EXPORT QgsLocatorResult
     /**
      * Constructor for QgsLocatorResult.
      */
-    QgsLocatorResult() = default;
+    QgsLocatorResult()
+      : filter( nullptr )
+      , score( 0.5 )
+    {}
 
     /**
      * Constructor for QgsLocatorResult.
@@ -50,6 +53,7 @@ class GUI_EXPORT QgsLocatorResult
       : filter( filter )
       , displayString( displayString )
       , userData( userData )
+      , score( 0.5 )
     {}
 
     /**
@@ -75,7 +79,7 @@ class GUI_EXPORT QgsLocatorResult
     /**
      * Match score, from 0 - 1, where 1 represents a perfect match.
      */
-    double score = 0.5;
+    double score;
 
 };
 
@@ -173,6 +177,14 @@ class GUI_EXPORT QgsLocatorFilter : public QObject
      */
     void setUseWithoutPrefix( bool useWithoutPrefix );
 
+    /**
+     * Tests a \a candidate string to see if it should be considered a match for
+     * a specified \a search string.
+     * Filter subclasses should use this method when comparing strings instead
+     * of directly using QString::contains() or Python 'in' checks.
+     */
+    static bool stringMatches( const QString &candidate, const QString &search );
+
   signals:
 
     /**