[FEATURE][multiedit] Add shortcut to modify attributes of selected

features to edit menu

Workflow:
- enter edit mode, select multiple features
- select Edit -> Modify Attributes of Selected Features
- edit attributes using feature form, click OK or Cancel

src/app/qgisapp.cpp

@@ -1388,6 +1388,7 @@ void QgisApp::createActions()
   connect( mActionDeletePart, SIGNAL( triggered() ), this, SLOT( deletePart() ) );
   connect( mActionMergeFeatures, SIGNAL( triggered() ), this, SLOT( mergeSelectedFeatures() ) );
   connect( mActionMergeFeatureAttributes, SIGNAL( triggered() ), this, SLOT( mergeAttributesOfSelectedFeatures() ) );
+  connect( mActionMultiEditAttributes, SIGNAL( triggered() ), this, SLOT( modifyAttributesOfSelectedFeatures() ) );
   connect( mActionNodeTool, SIGNAL( triggered() ), this, SLOT( nodeTool() ) );
   connect( mActionRotatePointSymbols, SIGNAL( triggered() ), this, SLOT( rotatePointSymbols() ) );
   connect( mActionSnappingOptions, SIGNAL( triggered() ), this, SLOT( snappingOptions() ) );
@@ -6551,6 +6552,45 @@ void QgisApp::mergeAttributesOfSelectedFeatures()
   }
 }
 
+void QgisApp::modifyAttributesOfSelectedFeatures()
+{
+  QgsMapLayer* activeMapLayer = activeLayer();
+  if ( !activeMapLayer )
+  {
+    messageBar()->pushMessage(
+      tr( "No active layer" ),
+      tr( "Please select a layer in the layer list" ),
+      QgsMessageBar::WARNING );
+    return;
+  }
+
+  QgsVectorLayer* vl = qobject_cast<QgsVectorLayer *>( activeMapLayer );
+  if ( !vl )
+  {
+    messageBar()->pushMessage(
+      tr( "Invalid layer" ),
+      tr( "The merge features tool only works on vector layers." ),
+      QgsMessageBar::WARNING );
+    return;
+  }
+  if ( !vl->isEditable() )
+  {
+    messageBar()->pushMessage(
+      tr( "Layer not editable" ),
+      tr( "Modifying features can only be done for layers in editing mode." ),
+      QgsMessageBar::WARNING );
+
+    return;
+  }
+
+  //dummy feature
+  QgsFeature f;
+  QgsAttributeDialog* dialog = new QgsAttributeDialog( vl, &f, false, this );
+  dialog->setMode( QgsAttributeForm::MultiEditMode );
+  dialog->exec();
+
+}
+
 void QgisApp::mergeSelectedFeatures()
 {
   //get active layer (hopefully vector)
@@ -9998,6 +10038,7 @@ void QgisApp::activateDeactivateLayerRelatedActions( QgsMapLayer* layer )
     mActionSplitParts->setEnabled( false );
     mActionMergeFeatures->setEnabled( false );
     mActionMergeFeatureAttributes->setEnabled( false );
+    mActionMultiEditAttributes->setEnabled( false );
     mActionRotatePointSymbols->setEnabled( false );
     mActionEnableTracing->setEnabled( false );
 
@@ -10109,11 +10150,13 @@ void QgisApp::activateDeactivateLayerRelatedActions( QgsMapLayer* layer )
       {
         mActionMergeFeatures->setEnabled( layerHasSelection && canDeleteFeatures && canAddFeatures );
         mActionMergeFeatureAttributes->setEnabled( layerHasSelection );
+        mActionMultiEditAttributes->setEnabled( layerHasSelection );
       }
       else
       {
         mActionMergeFeatures->setEnabled( false );
         mActionMergeFeatureAttributes->setEnabled( false );
+        mActionMultiEditAttributes->setEnabled( false );
       }
 
       bool isMultiPart = QGis::isMultiType( vlayer->wkbType() ) || !dprovider->doesStrictFeatureTypeCheck();

src/app/qgisapp.h

@@ -1034,6 +1034,8 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
     void mergeSelectedFeatures();
     //! merges the attributes of selected features
     void mergeAttributesOfSelectedFeatures();
+    //! Modifies the attributes of selected features via feature form
+    void modifyAttributesOfSelectedFeatures();
     //! provides operations with nodes
     void nodeTool();
     //! activates the rotate points tool

src/gui/qgsattributeform.cpp

@@ -186,6 +186,7 @@ void QgsAttributeForm::setMode( QgsAttributeForm::Mode mode )
 
     case QgsAttributeForm::MultiEditMode:
       resetMultiEdit( false );
+      synchronizeEnabledState();
       break;
   }
 
@@ -433,7 +434,8 @@ bool QgsAttributeForm::saveMultiEdits()
     mMultiEditMessageBarItem = new QgsMessageBarItem( tr( "Changes could not be applied" ), QgsMessageBar::WARNING, messageTimeout() );
   }
 
-  mMessageBar->pushItem( mMultiEditMessageBarItem );
+  if ( !mButtonBox->isVisible() )
+    mMessageBar->pushItem( mMultiEditMessageBarItem );
   return success;
 }
 
@@ -482,12 +484,14 @@ void QgsAttributeForm::clearMultiEditMessages()
 {
   if ( mMultiEditUnsavedMessageBarItem )
   {
-    mMessageBar->popWidget( mMultiEditUnsavedMessageBarItem );
+    if ( !mButtonBox->isVisible() )
+      mMessageBar->popWidget( mMultiEditUnsavedMessageBarItem );
     mMultiEditUnsavedMessageBarItem = nullptr;
   }
   if ( mMultiEditMessageBarItem )
   {
-    mMessageBar->popWidget( mMultiEditMessageBarItem );
+    if ( !mButtonBox->isVisible() )
+      mMessageBar->popWidget( mMultiEditMessageBarItem );
     mMultiEditMessageBarItem = nullptr;
   }
 }
@@ -523,7 +527,8 @@ void QgsAttributeForm::onAttributeChanged( const QVariant& value )
         clearMultiEditMessages();
 
         mMultiEditUnsavedMessageBarItem = new QgsMessageBarItem( msgLabel, QgsMessageBar::WARNING );
-        mMessageBar->pushItem( mMultiEditUnsavedMessageBarItem );
+        if ( !mButtonBox->isVisible() )
+          mMessageBar->pushItem( mMultiEditUnsavedMessageBarItem );
       }
       break;
     }
@@ -608,7 +613,9 @@ void QgsAttributeForm::refreshFeature()
 
 void QgsAttributeForm::synchronizeEnabledState()
 {
-  bool isEditable = ( mFeature.isValid() || mMode == AddFeatureMode ) && mLayer->isEditable();
+  bool isEditable = ( mFeature.isValid()
+                      || mMode == AddFeatureMode
+                      || mMode == MultiEditMode ) && mLayer->isEditable();
 
   Q_FOREACH ( QgsWidgetWrapper* ww, mWidgets )
   {

src/ui/qgisapp.ui

@@ -17,7 +17,7 @@
      <x>0</x>
      <y>0</y>
      <width>1050</width>
-     <height>19</height>
+     <height>25</height>
     </rect>
    </property>
    <property name="toolTip">
@@ -271,6 +271,7 @@
     <addaction name="mActionAddFeature"/>
     <addaction name="mActionMoveFeature"/>
     <addaction name="mActionDeleteSelected"/>
+    <addaction name="mActionMultiEditAttributes"/>
     <addaction name="separator"/>
     <addaction name="mActionRotateFeature"/>
     <addaction name="mActionSimplifyFeature"/>
@@ -2479,6 +2480,18 @@ Acts on currently active editable layer</string>
     <string>New GeoPackage Layer...</string>
    </property>
   </action>
+  <action name="mActionMultiEditAttributes">
+   <property name="icon">
+    <iconset resource="../../images/images.qrc">
+     <normaloff>:/images/themes/default/mActionAllEdits.svg</normaloff>:/images/themes/default/mActionAllEdits.svg</iconset>
+   </property>
+   <property name="text">
+    <string>Modify Attributes of Selected Features</string>
+   </property>
+   <property name="toolTip">
+    <string>Modify the Attributes of all Selected Features Simultaneously</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="../../images/images.qrc"/>