src/vs/workbench/contrib/markers/browser/markersView.ts/MarkersView/setCurrentActiveEditor
class MarkersView:	private setCurrentActiveEditor(): void {
		const activeEditor = this.editorService.activeEditor;
		this.currentActiveResource = activeEditor ? withUndefinedAsNull(EditorResourceAccessor.getOriginalUri(activeEditor, { supportSideBySide: SideBySideEditor.PRIMARY })) : null;
	}