Add Run Selected option to right click menu for selected algorithms

python/PyQt6/gui/auto_generated/processing/models/qgsmodelcomponentgraphicitem.sip.in

@@ -407,6 +407,13 @@ Sets the ``results`` obtained for this child algorithm for the last model execut
 %Docstring
 Emitted when the user opts to run the model from this child algorithm.
 
+.. versionadded:: 3.38
+%End
+
+    void runSelected();
+%Docstring
+Emitted when the user opts to run selected steps from the model.
+
 .. versionadded:: 3.38
 %End
 

python/PyQt6/gui/auto_generated/processing/models/qgsmodelgraphicsscene.sip.in

@@ -172,6 +172,13 @@ Emitted whenever a component of the model is changed.
 %Docstring
 Emitted whenever the selected item changes.
 If ``None``, no item is selected.
+%End
+
+    void runSelected();
+%Docstring
+Emitted when the user opts to run selected steps from the model.
+
+.. versionadded:: 3.38
 %End
 
     void runFromChild( const QString &childId );

python/gui/auto_generated/processing/models/qgsmodelcomponentgraphicitem.sip.in

@@ -407,6 +407,13 @@ Sets the ``results`` obtained for this child algorithm for the last model execut
 %Docstring
 Emitted when the user opts to run the model from this child algorithm.
 
+.. versionadded:: 3.38
+%End
+
+    void runSelected();
+%Docstring
+Emitted when the user opts to run selected steps from the model.
+
 .. versionadded:: 3.38
 %End
 

python/gui/auto_generated/processing/models/qgsmodelgraphicsscene.sip.in

@@ -172,6 +172,13 @@ Emitted whenever a component of the model is changed.
 %Docstring
 Emitted whenever the selected item changes.
 If ``None``, no item is selected.
+%End
+
+    void runSelected();
+%Docstring
+Emitted when the user opts to run selected steps from the model.
+
+.. versionadded:: 3.38
 %End
 
     void runFromChild( const QString &childId );

src/gui/processing/models/qgsmodelcomponentgraphicitem.cpp

@@ -870,9 +870,18 @@ QgsModelChildAlgorithmGraphicItem::QgsModelChildAlgorithmGraphicItem( QgsProcess
 void QgsModelChildAlgorithmGraphicItem::contextMenuEvent( QGraphicsSceneContextMenuEvent *event )
 {
   QMenu *popupmenu = new QMenu( event->widget() );
+
+  if ( isSelected() )
+  {
+    QAction *runSelectedStepsAction = popupmenu->addAction( QObject::tr( "Run Selected Steps…" ) );
+    runSelectedStepsAction->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "mActionStart.svg" ) ) );
+    connect( runSelectedStepsAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::runSelected );
+  }
+
   QAction *runFromHereAction = popupmenu->addAction( QObject::tr( "Run from Here…" ) );
   runFromHereAction->setIcon( QgsApplication::getThemeIcon( QStringLiteral( "mActionStart.svg" ) ) );
   connect( runFromHereAction, &QAction::triggered, this, &QgsModelChildAlgorithmGraphicItem::runFromHere );
+
   popupmenu->addSeparator();
 
   QAction *removeAction = popupmenu->addAction( QObject::tr( "Remove" ) );

src/gui/processing/models/qgsmodelcomponentgraphicitem.h

@@ -475,6 +475,13 @@ class GUI_EXPORT QgsModelChildAlgorithmGraphicItem : public QgsModelComponentGra
     */
     void runFromHere();
 
+    /**
+     * Emitted when the user opts to run selected steps from the model.
+     *
+     * \since QGIS 3.38
+    */
+    void runSelected();
+
     /**
      * Emitted when the user opts to view previous results from this child algorithm.
      *

src/gui/processing/models/qgsmodeldesignerdialog.cpp

@@ -514,6 +514,7 @@ void QgsModelDesignerDialog::setModelScene( QgsModelGraphicsScene *scene )
   connect( mScene, &QgsModelGraphicsScene::componentAboutToChange, this, [ = ]( const QString & description, int id ) { beginUndoCommand( description, id ); } );
   connect( mScene, &QgsModelGraphicsScene::componentChanged, this, [ = ] { endUndoCommand(); } );
   connect( mScene, &QgsModelGraphicsScene::runFromChild, this, &QgsModelDesignerDialog::runFromChild );
+  connect( mScene, &QgsModelGraphicsScene::runSelected, this, &QgsModelDesignerDialog::runSelectedSteps );
   connect( mScene, &QgsModelGraphicsScene::showChildAlgorithmOutputs, this, &QgsModelDesignerDialog::showChildAlgorithmOutputs );
   connect( mScene, &QgsModelGraphicsScene::showChildAlgorithmLog, this, &QgsModelDesignerDialog::showChildAlgorithmLog );
 

src/gui/processing/models/qgsmodelgraphicsscene.cpp

@@ -149,6 +149,7 @@ void QgsModelGraphicsScene::createItems( QgsProcessingModelAlgorithm *model, Qgs
     {
       emit runFromChild( childId );
     } );
+    connect( item, &QgsModelChildAlgorithmGraphicItem::runSelected, this, &QgsModelGraphicsScene::runSelected );
     connect( item, &QgsModelChildAlgorithmGraphicItem::showPreviousResults, this, [this, childId]
     {
       emit showChildAlgorithmOutputs( childId );

src/gui/processing/models/qgsmodelgraphicsscene.h

@@ -187,6 +187,13 @@ class GUI_EXPORT QgsModelGraphicsScene : public QGraphicsScene
      */
     void selectedItemChanged( QgsModelComponentGraphicItem *selected );
 
+    /**
+     * Emitted when the user opts to run selected steps from the model.
+     *
+     * \since QGIS 3.38
+    */
+    void runSelected();
+
     /**
      * Emitted when the user opts to run the part of the model starting from the specified child algorithm.
      *