Fix freeze on long indexation for snapping on intersections

If snap on intersections is enabled, this specific edge search with the locator was not in relaxed mode, whereas the standard snapping is happening in relaxed mode. As a result, trying to use the snapping during the first indexation was freezing QGIS while the indexation is happening, waiting for it to end. On a layer where the indexation is longer than the timeout (30sec, i.e. a WFS layer as in issue #51179), the locator stops abruptly and resets itself, crashing the indexation and QGIS.
qgis · Nov 29, 2024 · f3f1f2c · f3f1f2c
1 parent eb9c630
commit f3f1f2c
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Showing 3 changed files with 44 additions and 17 deletions.
diff --git a/src/core/qgssnappingutils.cpp b/src/core/qgssnappingutils.cpp
@@ -291,21 +291,15 @@ QgsPointLocator::Match QgsSnappingUtils::snapToMap( const QgsPointXY &pointMap,
     QgsPointLocator::Match bestMatch;
     QgsPointLocator::MatchList edges; // for snap on intersection
     _updateBestMatch( bestMatch, pointMap, loc, type, tolerance, filter, relaxed );
-
     if ( mSnappingConfig.intersectionSnapping() )
-    {
-      QgsPointLocator *locEdges = locatorForLayerUsingStrategy( mCurrentLayer, pointMap, tolerance );
-      if ( !locEdges )
-        return QgsPointLocator::Match();
-      edges = locEdges->edgesInRect( pointMap, tolerance );
-    }
+      edges = loc->edgesInRect( pointMap, tolerance, filter, relaxed );
 
     for ( QgsVectorLayer *vl : mExtraSnapLayers )
     {
       QgsPointLocator *loc = locatorForLayerUsingStrategy( vl, pointMap, tolerance );
       _updateBestMatch( bestMatch, pointMap, loc, type, tolerance, filter, false );
       if ( mSnappingConfig.intersectionSnapping() )
-        edges << loc->edgesInRect( pointMap, tolerance );
+        edges << loc->edgesInRect( pointMap, tolerance, filter, false );
     }
 
     if ( mSnappingConfig.intersectionSnapping() )
@@ -357,11 +351,9 @@ QgsPointLocator::Match QgsSnappingUtils::snapToMap( const QgsPointXY &pointMap,
       if ( QgsPointLocator *loc = locatorForLayerUsingStrategy( layerConfig.layer, pointMap, tolerance ) )
       {
         _updateBestMatch( bestMatch, pointMap, loc, layerConfig.type, tolerance, filter, relaxed );
-
         if ( mSnappingConfig.intersectionSnapping() )
-        {
-          edges << loc->edgesInRect( pointMap, tolerance );
-        }
+          edges << loc->edgesInRect( pointMap, tolerance, filter, relaxed );
+
         // We keep the maximum tolerance for intersection snapping and extra snapping
         maxTolerance = std::max( maxTolerance, tolerance );
         // To avoid yet an additional setting, on extra snappings, we use the combination of all enabled snap types
@@ -374,7 +366,7 @@ QgsPointLocator::Match QgsSnappingUtils::snapToMap( const QgsPointXY &pointMap,
       QgsPointLocator *loc = locatorForLayerUsingStrategy( vl, pointMap, maxTolerance );
       _updateBestMatch( bestMatch, pointMap, loc, maxTypes, maxTolerance, filter, false );
       if ( mSnappingConfig.intersectionSnapping() )
-        edges << loc->edgesInRect( pointMap, maxTolerance );
+        edges << loc->edgesInRect( pointMap, maxTolerance, filter, false );
     }
 
     if ( mSnappingConfig.intersectionSnapping() )
@@ -405,9 +397,8 @@ QgsPointLocator::Match QgsSnappingUtils::snapToMap( const QgsPointXY &pointMap,
       if ( QgsPointLocator *loc = locatorForLayerUsingStrategy( vl, pointMap, tolerance ) )
       {
         _updateBestMatch( bestMatch, pointMap, loc, type, tolerance, filter, relaxed );
-
         if ( mSnappingConfig.intersectionSnapping() )
-          edges << loc->edgesInRect( pointMap, tolerance );
+          edges << loc->edgesInRect( pointMap, tolerance, filter, relaxed );
       }
     }
 
@@ -416,7 +407,7 @@ QgsPointLocator::Match QgsSnappingUtils::snapToMap( const QgsPointXY &pointMap,
       QgsPointLocator *loc = locatorForLayerUsingStrategy( vl, pointMap, tolerance );
       _updateBestMatch( bestMatch, pointMap, loc, type, tolerance, filter, false );
       if ( mSnappingConfig.intersectionSnapping() )
-        edges << loc->edgesInRect( pointMap, tolerance );
+        edges << loc->edgesInRect( pointMap, tolerance, filter, false );
     }
 
     if ( mSnappingConfig.intersectionSnapping() )

diff --git a/tests/src/app/maptooladdfeatureline/testqgsmaptooladdfeatureline.cpp b/tests/src/app/maptooladdfeatureline/testqgsmaptooladdfeatureline.cpp
@@ -1006,6 +1006,15 @@ void TestQgsMapToolAddFeatureLine::testWithTopologicalEditingDifferentCanvasCrs(
   snapConfig.project()->setTopologicalEditing( true );
   mCanvas->snappingUtils()->setConfig( snapConfig );
 
+  // Wait for indexing to complete
+  if ( QgsPointLocator *loc = mCanvas->snappingUtils()->locatorForLayer( mLayerCRS3946Line ) )
+  {
+    if ( loc->isIndexing() )
+    {
+      loc->waitForIndexingFinished();
+    }
+  }
+
   // add a line with one vertex near the previous line
   utils.mouseClick( 10, 0, Qt::LeftButton );
   utils.mouseClick( 4.9, 5.1, Qt::LeftButton );
@@ -1086,6 +1095,15 @@ void TestQgsMapToolAddFeatureLine::testWithTopologicalEditingWIthDiffLayerWithDi
   snapConfig.project()->setTopologicalEditing( true );
   mCanvas->snappingUtils()->setConfig( snapConfig );
 
+  // Wait for indexing to complete
+  if ( QgsPointLocator *loc = mCanvas->snappingUtils()->locatorForLayer( mLayerCRS3945Line ) )
+  {
+    if ( loc->isIndexing() )
+    {
+      loc->waitForIndexingFinished();
+    }
+  }
+
   // test the topological editing
   utils.mouseClick( 0, 5, Qt::LeftButton );
   utils.mouseClick( 10.1, 5, Qt::LeftButton );

diff --git a/tests/src/app/testqgsadvanceddigitizing.cpp b/tests/src/app/testqgsadvanceddigitizing.cpp
@@ -16,7 +16,6 @@
 #include "qgstest.h"
 
 #include "qgsadvanceddigitizingdockwidget.h"
-#include "qgsguiutils.h"
 #include "qgsapplication.h"
 #include "qgsmapcanvas.h"
 #include "qgsvectorlayer.h"
@@ -606,6 +605,16 @@ void TestQgsAdvancedDigitizing::coordinateConstraintWhenSnapping()
   snapConfig.setEnabled( true );
   mCanvas->snappingUtils()->setConfig( snapConfig );
 
+  // move to trigger a re-indexing and wait for it to complete
+  utils.mouseMove( 0, 0 );
+  if ( QgsPointLocator *loc = mCanvas->snappingUtils()->locatorForLayer( mLayer3950 ) )
+  {
+    if ( loc->isIndexing() )
+    {
+      loc->waitForIndexingFinished();
+    }
+  }
+
   // simple snap test
   utils.mouseClick( 0, 2, Qt::LeftButton );
   utils.mouseClick( 2.02, 2, Qt::LeftButton );
@@ -806,6 +815,15 @@ void TestQgsAdvancedDigitizing::lineExtensionConstraintGeographicCrs()
   snapConfig.setTypeFlag( Qgis::SnappingType::Vertex | Qgis::SnappingType::Segment );
   mCanvas->snappingUtils()->setConfig( snapConfig );
 
+  // Wait for indexing to complete
+  if ( QgsPointLocator *loc = mCanvas->snappingUtils()->locatorForLayer( mLayer4326 ) )
+  {
+    if ( loc->isIndexing() )
+    {
+      loc->waitForIndexingFinished();
+    }
+  }
+
   // test snapping on segment
   utils.mouseMove( 4.9, 5.1 );
   QCOMPARE( mAdvancedDigitizingDockWidget->currentPointV2(), QgsPoint( 5, 5 ) );