[dualview] Remove attrs from feature dialog when deleted (Fix #8504)

Author: m-kuhn

src/gui/attributetable/qgsdualview.cpp

@@ -214,6 +214,8 @@ void QgsDualView::initLayerCache( QgsVectorLayer* layer )
 
     mLayerCache->setFullCache( true );
   }
+
+  connect( layer, SIGNAL( attributeDeleted( int ) ), this, SLOT( attributeDeleted( int ) ) );
 }
 
 void QgsDualView::initModels( QgsMapCanvas* mapCanvas )
@@ -380,6 +382,28 @@ void QgsDualView::previewExpressionChanged( const QString expression )
   mLayerCache->layer()->setDisplayExpression( expression );
 }
 
+void QgsDualView::attributeDeleted( int attribute )
+{
+  if ( mAttributeDialog && mAttributeDialog->dialog() )
+  {
+    // Let the dialog write the edited widget values to it's feature
+    mAttributeDialog->accept();
+    // Get the edited feature
+    QgsFeature* feat = mAttributeDialog->feature();
+    feat->deleteAttribute( attribute );
+
+    // Backup old dialog and delete only after creating the new dialog, so we can "hot-swap" the contained QgsFeature
+    QgsAttributeDialog* oldDialog = mAttributeDialog;
+
+    mAttributeEditorLayout->removeWidget( mAttributeDialog->dialog() );
+
+    mAttributeDialog = new QgsAttributeDialog( mLayerCache->layer(), new QgsFeature( *feat ), true, mDistanceArea, this, false );
+    mAttributeEditorLayout->addWidget( mAttributeDialog->dialog() );
+
+    delete oldDialog;
+  }
+}
+
 void QgsDualView::setFilteredFeatures( QgsFeatureIds filteredFeatures )
 {
   mFilterModel->setFilteredFeatures( filteredFeatures );

src/gui/attributetable/qgsdualview.h

@@ -183,6 +183,14 @@ class GUI_EXPORT QgsDualView : public QStackedWidget, private Ui::QgsDualViewBas
 
     void previewExpressionChanged( const QString expression );
 
+    /**
+     * If an attribute on this layer is deleted, close any open editors
+     * (as long as the attribute dialog is not able to handle this problem)
+     *
+     * @param attribute The attribute being deleted
+     */
+    void attributeDeleted( int attribute );
+
     /**
      * Will be called periodically, when loading layers from slow data providers.
      *

src/gui/attributetable/qgsfeaturelistview.h

@@ -53,7 +53,7 @@ class GUI_EXPORT QgsFeatureListView : public QListView
     /**
      * Destructor
      */
-    virtual ~QgsFeatureListView() {};
+    virtual ~QgsFeatureListView() {}
 
     /**
      * Returns the layer cache