Revert "Merge pull request #8177 from elpaso/bugfix-20094-field-calcu…

…lator-slowness"

This reverts commit 096b4ce, reversing
changes made to 87e0f69.

python/core/auto_generated/qgsapplication.sip.in

@@ -824,7 +824,6 @@ Emits the signal to collect all the strings of .qgs to be included in ts file
 .. versionadded:: 3.4
 %End
 
-
 %If (ANDROID)
     //dummy method to workaround sip generation issue
     bool x11EventFilter( XEvent *event );
@@ -853,7 +852,6 @@ In order to register translatable strings, connect to this signal and register t
 .. versionadded:: 3.4
 %End
 
-
 };
 
 

python/core/auto_generated/qgsvectorlayer.sip.in

@@ -2377,13 +2377,6 @@ Is emitted, before changes are committed to the data provider
     void beforeRollBack();
 %Docstring
 Is emitted, before changes are rolled back
-%End
-
-    void afterRollBack();
-%Docstring
-Is emitted, after changes are rolled back
-
-.. versionadded:: 3.4
 %End
 
     void attributeAdded( int idx );

src/app/qgisapp.cpp

@@ -7091,14 +7091,13 @@ void QgisApp::fieldCalculator()
 
 void QgisApp::attributeTable( QgsAttributeTableFilterModel::FilterMode filter )
 {
-  QgsVectorLayer *vectorLayer = qobject_cast<QgsVectorLayer *>( activeLayer() );
-  if ( !vectorLayer )
+  QgsVectorLayer *myLayer = qobject_cast<QgsVectorLayer *>( activeLayer() );
+  if ( !myLayer )
   {
     return;
   }
 
-  QgsAttributeTableDialog *mDialog = new QgsAttributeTableDialog( vectorLayer, filter );
-
+  QgsAttributeTableDialog *mDialog = new QgsAttributeTableDialog( myLayer, filter );
   mDialog->show();
   // the dialog will be deleted by itself on close
 }
@@ -9190,7 +9189,6 @@ bool QgisApp::toggleEditing( QgsMapLayer *layer, bool allowCancel )
   return res;
 }
 
-
 void QgisApp::saveActiveLayerEdits()
 {
   saveEdits( activeLayer(), true, true );
@@ -14148,8 +14146,3 @@ void QgisApp::triggerCrashHandler()
   RaiseException( 0x12345678, 0, 0, nullptr );
 #endif
 }
-
-void QgisApp::blockAttributeTableUpdates( const QgsVectorLayer *layer, const bool blocked )
-{
-  emit attributeTableUpdateBlocked( layer, blocked );
-}

src/app/qgisapp.h

@@ -1008,13 +1008,6 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
      */
     void triggerCrashHandler();
 
-    /**
-     * Emits the signal to set the \a blocked state of attribute tables connected a particular \a layer
-     *
-     * \since QGIS 3.4
-     */
-    void blockAttributeTableUpdates( const QgsVectorLayer *layer, const bool blocked );
-
   protected:
 
     //! Handle state changes (WindowTitleChange)
@@ -1743,13 +1736,6 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
      */
     void activeLayerChanged( QgsMapLayer *layer );
 
-    /**
-     * Emitted when \a blocked status of attribute table updates for a particular \a layer must change
-     *
-     * \since QGIS 3.4
-     */
-    void attributeTableUpdateBlocked( const QgsVectorLayer *layer, const bool blocked );
-
   private:
     void startProfile( const QString &name );
     void endProfile();

src/app/qgsattributetabledialog.cpp

@@ -113,16 +113,6 @@ QgsAttributeTableDialog::QgsAttributeTableDialog( QgsVectorLayer *layer, QgsAttr
   connect( mActionExpressionSelect, &QAction::triggered, this, &QgsAttributeTableDialog::mActionExpressionSelect_triggered );
   connect( mMainView, &QgsDualView::showContextMenuExternally, this, &QgsAttributeTableDialog::showContextMenu );
 
-  // Block/unblock table updates (feature cache signals)
-  connect( QgisApp::instance(), &QgisApp::attributeTableUpdateBlocked, this, [ = ]( const QgsVectorLayer * layer, const bool blocked )
-  {
-    if ( layer == mLayer )
-      this->blockCacheUpdateSignals( blocked );
-  } );
-  // Massive rollbacks can also freeze the GUI due to the feature cache signals
-  connect( mLayer, &QgsVectorLayer::beforeRollBack, this, [ = ] { this->blockCacheUpdateSignals( true ); } );
-  connect( mLayer, &QgsVectorLayer::afterRollBack, this, [ = ] { this->blockCacheUpdateSignals( false ); } );
-
   const QgsFields fields = mLayer->fields();
   for ( const QgsField &field : fields )
   {
@@ -743,6 +733,7 @@ void QgsAttributeTableDialog::mActionOpenFieldCalculator_triggered()
   if ( calc.exec() == QDialog::Accepted )
   {
     int col = masterModel->fieldCol( calc.changedAttributeId() );
+
     if ( col >= 0 )
     {
       masterModel->reload( masterModel->index( 0, col ), masterModel->index( masterModel->rowCount() - 1, col ) );
@@ -1154,15 +1145,6 @@ void QgsAttributeTableDialog::setFilterExpression( const QString &filterString,
   mMainView->setFilterMode( QgsAttributeTableFilterModel::ShowFilteredList );
 }
 
-void QgsAttributeTableDialog::blockCacheUpdateSignals( const bool block )
-{
-  QgsAttributeTableModel *masterModel = mMainView->masterModel();
-
-  if ( ! masterModel )
-    return;
-
-  masterModel->layerCache()->blockSignals( block );
-}
 
 void QgsAttributeTableDialog::deleteFeature( const QgsFeatureId fid )
 {

src/app/qgsattributetabledialog.h

@@ -242,7 +242,6 @@ class APP_EXPORT QgsAttributeTableDialog : public QDialog, private Ui::QgsAttrib
 
     void updateMultiEditButtonState();
     void deleteFeature( QgsFeatureId fid );
-    void blockCacheUpdateSignals( const bool block );
 
     friend class TestQgsAttributeTable;
 };

src/app/qgsfieldcalculator.cpp

@@ -159,10 +159,8 @@ void QgsFieldCalculator::accept()
 {
   builder->saveToRecent( QStringLiteral( "fieldcalc" ) );
 
-  if ( ! mVectorLayer )
-  {
+  if ( !mVectorLayer )
     return;
-  }
 
   // Set up QgsDistanceArea each time we (re-)calculate
   QgsDistanceArea myDa;
@@ -262,10 +260,6 @@ void QgsFieldCalculator::accept()
       return;
     }
 
-    // Begin feature modifications, block updates for attr tables
-    // connected to this layer
-    QgisApp::instance()->blockAttributeTableUpdates( mVectorLayer, true );
-
     //go through all the features and change the new attribute
     QgsFeature feature;
     bool calculationSuccess = true;
@@ -326,8 +320,6 @@ void QgsFieldCalculator::accept()
       rownum++;
     }
 
-    QgisApp::instance()->blockAttributeTableUpdates( mVectorLayer, false );
-
     if ( !calculationSuccess )
     {
       cursorOverride.release();
@@ -336,6 +328,7 @@ void QgsFieldCalculator::accept()
       mVectorLayer->destroyEditCommand();
       return;
     }
+
     mVectorLayer->endEditCommand();
   }
   QDialog::accept();

src/core/qgsapplication.cpp

@@ -1528,7 +1528,6 @@ void QgsApplication::collectTranslatableObjects( QgsTranslationContext *translat
   emit requestForTranslatableObjects( translationContext );
 }
 
-
 QString QgsApplication::nullRepresentation()
 {
   ApplicationMembers *appMembers = members();

src/core/qgsapplication.h

@@ -757,7 +757,6 @@ class CORE_EXPORT QgsApplication : public QApplication
      */
     void collectTranslatableObjects( QgsTranslationContext *translationContext );
 
-
 #ifdef SIP_RUN
     SIP_IF_FEATURE( ANDROID )
     //dummy method to workaround sip generation issue
@@ -789,7 +788,6 @@ class CORE_EXPORT QgsApplication : public QApplication
      */
     void requestForTranslatableObjects( QgsTranslationContext *translationContext );
 
-
   private:
 
     static void copyPath( const QString &src, const QString &dst );

src/core/qgsvectorlayer.cpp

@@ -2983,8 +2983,6 @@ bool QgsVectorLayer::rollBack( bool deleteBuffer )
 
   mEditBuffer->rollBack();
 
-  emit afterRollBack();
-
   if ( isModified() )
   {
     // new undo stack roll back method

src/core/qgsvectorlayer.h

@@ -2173,12 +2173,6 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer, public QgsExpressionConte
     //! Is emitted, before changes are rolled back
     void beforeRollBack();
 
-    /**
-     * Is emitted, after changes are rolled back
-     * \since QGIS 3.4
-     */
-    void afterRollBack();
-
     /**
      * Will be emitted, when a new attribute has been added to this vector layer.
      * Applies only to types QgsFields::OriginEdit, QgsFields::OriginProvider and QgsFields::OriginExpression