[bugfix][ogr] Recompute capabilities when subsetfilter is set

Need to re-open in rw mode if mDynamicWriteAccess

src/providers/ogr/qgsogrprovider.cpp

@@ -607,7 +607,7 @@ bool QgsOgrProvider::setSubsetString( const QString &theSQL, bool updateFeatureC
   invalidateCachedExtent( false );
 
   // Changing the filter may change capabilities
-  computeCapabilities();
+  emit capabilitiesNeedUpdate();
 
   emit dataChanged();
 
@@ -2186,10 +2186,19 @@ QgsVectorDataProvider::Capabilities QgsOgrProvider::capabilities() const
 void QgsOgrProvider::computeCapabilities()
 {
   QgsVectorDataProvider::Capabilities ability = nullptr;
+  bool updateModeActivated = false;
 
   // collect abilities reported by OGR
   if ( mOgrLayer )
   {
+
+    // We want the layer in rw mode or capabilities will be wrong
+    // If mUpdateModeStackDepth > 0, it means that an updateMode is already active and that we have write access
+    if ( mUpdateModeStackDepth == 0 )
+    {
+      updateModeActivated = _enterUpdateMode( true );
+    }
+
     // Whilst the OGR documentation (e.g. at
     // http://www.gdal.org/ogr/classOGRLayer.html#a17) states "The capability
     // codes that can be tested are represented as strings, but #defined
@@ -2318,6 +2327,9 @@ void QgsOgrProvider::computeCapabilities()
     }
   }
 
+  if ( updateModeActivated )
+    leaveUpdateMode();
+
   mCapabilities = ability;
 }
 
@@ -4038,6 +4050,13 @@ void QgsOgrProvider::open( OpenMode mode )
     }
   }
 
+  // Connect
+  if ( mode == OpenModeInitial )
+    connect( this, &QgsOgrProvider::capabilitiesNeedUpdate, this, [ =  ]
+  {
+    computeCapabilities();
+  } );
+
   // For debug/testing purposes
   if ( !mValid )
     setProperty( "_debug_open_mode", "invalid" );

src/providers/ogr/qgsogrprovider.h

@@ -309,6 +309,11 @@ class QgsOgrProvider : public QgsVectorDataProvider
     void setupProxy();
 #endif
 
+  signals:
+
+    //! Emitted when capabilities need to be re-computed
+    void capabilitiesNeedUpdate( );
+
 };
 
 /**