Resurrect dedicated action to create virtual layers in main window

This was removed when the data source manager was created, but
new virtual layers are a "creation" action, so it belongs alongside
the other "Create" actions like new shapefile, new gpkg, etc

It "feels" more natural then using the open data source dialog
to create a new virtual layer

Author: nyalldawson

images/images.qrc

@@ -744,6 +744,7 @@
         <file>themes/default/mIconFieldBool.svg</file>
         <file>themes/default/mIconDataDefineColor.svg</file>
         <file>themes/default/mIconDataDefineColorOn.svg</file>
+        <file>themes/default/mActionNewVirtualLayer.svg</file>
     </qresource>
     <qresource prefix="/images/tips">
         <file alias="symbol_levels.png">qgis_tips/symbol_levels.png</file>

images/themes/default/mActionNewVirtualLayer.svg

@@ -2203,6 +2203,7 @@ void QgisApp::createActions()
   connect( mActionNewSpatiaLiteLayer, &QAction::triggered, this, &QgisApp::newSpatialiteLayer );
   connect( mActionNewGeoPackageLayer, &QAction::triggered, this, &QgisApp::newGeoPackageLayer );
   connect( mActionNewMemoryLayer, &QAction::triggered, this, &QgisApp::newMemoryLayer );
+  connect( mActionNewVirtualLayer, &QAction::triggered, this, &QgisApp::addVirtualLayer );
   connect( mActionShowRasterCalculator, &QAction::triggered, this, &QgisApp::showRasterCalculator );
   connect( mActionShowMeshCalculator, &QAction::triggered, this, &QgisApp::showMeshCalculator );
   connect( mActionShowAlignRasterTool, &QAction::triggered, this, &QgisApp::showAlignRasterTool );
@@ -5316,15 +5317,15 @@ void QgisApp::addDatabaseLayers( QStringList const &layerPathList, QString const
 
 void QgisApp::addVirtualLayer()
 {
-  // show the Delimited text dialog
+  // show the virtual layer dialog
   QDialog *dts = dynamic_cast<QDialog *>( QgsProviderRegistry::instance()->createSelectionWidget( QStringLiteral( "virtual" ), this ) );
   if ( !dts )
   {
     QMessageBox::warning( this, tr( "Add Virtual Layer" ), tr( "Cannot get virtual layer select dialog from provider." ) );
     return;
   }
   connect( dts, SIGNAL( addVectorLayer( QString, QString, QString ) ),
-           this, SLOT( addSelectedVectorLayer( QString, QString, QString ) ) );
+           this, SLOT( onVirtualLayerAdded( QString, QString ) ) );
   connect( dts, SIGNAL( replaceVectorLayer( QString, QString, QString, QString ) ),
            this, SLOT( replaceSelectedVectorLayer( QString, QString, QString, QString ) ) );
   dts->exec();
@@ -12137,6 +12138,11 @@ int QgisApp::addDatabaseToolBarIcon( QAction *qAction )
   return 0;
 }
 
+void QgisApp::onVirtualLayerAdded( const QString &uri, const QString &layerName )
+{
+  addVectorLayer( uri, layerName, QStringLiteral( "virtual" ) );
+}
+
 QAction *QgisApp::addDatabaseToolBarWidget( QWidget *widget )
 {
   return mDatabaseToolBar->addWidget( widget );

src/app/qgisapp.cpp

@@ -1244,6 +1244,8 @@ class APP_EXPORT QgisApp : public QMainWindow, private Ui::MainWindow
     //! Add an icon to the Database toolbar
     int addDatabaseToolBarIcon( QAction *qAction );
 
+    void onVirtualLayerAdded( const QString &uri, const QString &layerName );
+
     /**
      * Add a widget to the database toolbar.
      * To remove this widget again, call removeDatabaseToolBarIcon()

src/app/qgisapp.h

@@ -164,6 +164,8 @@
      <addaction name="mActionNewVectorLayer"/>
      <addaction name="mActionNewSpatiaLiteLayer"/>
      <addaction name="mActionNewMemoryLayer"/>
+     <addaction name="separator"/>
+     <addaction name="mActionNewVirtualLayer"/>
     </widget>
     <widget class="QMenu" name="mAddLayerMenu">
      <property name="title">
@@ -683,6 +685,8 @@
    <addaction name="mActionNewVectorLayer"/>
    <addaction name="mActionNewSpatiaLiteLayer"/>
    <addaction name="mActionNewMemoryLayer"/>
+   <addaction name="separator"/>
+   <addaction name="mActionNewVirtualLayer"/>
   </widget>
   <widget class="QToolBar" name="mShapeDigitizeToolBar">
    <property name="windowTitle">
@@ -3171,6 +3175,18 @@ Acts on currently active editable layer</string>
     <string>Add Mesh Layer...</string>
    </property>
   </action>
+  <action name="mActionNewVirtualLayer">
+   <property name="icon">
+    <iconset resource="../../images/images.qrc">
+     <normaloff>:/images/themes/default/mActionNewVirtualLayer.svg</normaloff>:/images/themes/default/mActionNewVirtualLayer.svg</iconset>
+   </property>
+   <property name="text">
+    <string>New Virtual Layer…</string>
+   </property>
+   <property name="toolTip">
+    <string>New Virtual Layer</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="../../images/images.qrc"/>