src/vs/workbench/contrib/debug/common/debugModel.ts/StackFrame/openInEditor
class StackFrame:	async openInEditor(editorService: IEditorService, preserveFocus?: boolean, sideBySide?: boolean, pinned?: boolean): Promise<ITextEditorPane | undefined> {
		if (this.source.available) {
			return this.source.openInEditor(editorService, this.range, preserveFocus, sideBySide, pinned);
		}
		return undefined;
	}