Highlight origin of reference on click

Hi! 

Unfortunately, there is no such action in the action map declaration.

However, you could implement it via API.

Here are the steps to do it:

1) Create the plugin solution and the project plugin there (https://confluence.jetbrains.com/display/MPSD20181/Plugin)

2) Subscribe to the editor component creation in the init block of the project plugin:

myMessageBusConnection = project.getProject().getMessageBus().connect();
myMessageBusConnection.subscribe(EditorComponentCreateListener.EDITOR_COMPONENT_CREATION, myEditorComponentCreationHandler);

3) Define the 

myEditorComponentCreationHandler

as follows:

When the editor component is created, add the selection listener to its selection manager;

editorComponent.getSelectionManager().addSelectionListener(listener)

In the selection listener, you can find all the references of the selected node and highlight them:

editor.getHighlightManager().mark(message, this));
myEditorComponent.getHighlightManager().repaintAndRebuildEditorMessages();

In order to remove the messages, use

myEditorComponent.getHighlightManager().clearForOwner(this);

It's worth mentioning it is quite complicated task and we have this feature in our plan