src/vs/workbench/browser/parts/editor/editorGroupView.ts/EditorGroupView/onDidChangeEditorDirty
class EditorGroupView:	private onDidChangeEditorDirty(editor: EditorInput): void {

		// Always show dirty editors pinned
		this.pinEditor(editor);

		// Forward to title control
		this.titleAreaControl.updateEditorDirty(editor);

		// Event
		this._onDidGroupChange.fire({ kind: GroupChangeKind.EDITOR_DIRTY, editor });
	}