src/vs/editor/browser/editorExtensions.ts/MultiEditorAction/run
class MultiEditorAction:	public run(accessor: ServicesAccessor, editor: ICodeEditor, args: any): void | Promise<void> {
		for (const impl of this._implementations) {
			const result = impl[1](accessor, editor, args);
			if (result) {
				if (typeof result === 'boolean') {
					return;
				}
				return result;
			}
		}
	}