Update editor tabbar captions for better multi-root support

Fixes #5921

- updated the editor's caption (used for tabbars) in order
to better support multi-root workspaces, and align with VSCode.
Currently, when in a multi-root workspace there is no way to
easily distinguish which root the file resides in. With this
change the entire path is displayed, similarly to the explorer.

Signed-off-by: Vincent Fugnitto <vincent.fugnitto@ericsson.com>

packages/editor/src/browser/editor-widget-factory.ts

@@ -50,7 +50,7 @@ export class EditorWidgetFactory implements WidgetFactory {
             newEditor.title.closable = true;
             newEditor.title.label = this.labelProvider.getName(uri);
             newEditor.title.iconClass = icon + ' file-icon';
-            newEditor.title.caption = this.labelProvider.getLongName(uri);
+            newEditor.title.caption = uri.path.toString();
             return newEditor;
         });
     }