src/vs/workbench/contrib/markers/browser/markersTreeViewer.ts/MarkersViewModel/multiline
class MarkersViewModel:	set multiline(value: boolean) {
		let changed = false;
		if (this._multiline !== value) {
			this._multiline = value;
			changed = true;
		}
		this.bulkUpdate = true;
		this.markersViewStates.forEach(({ viewModel }) => {
			if (viewModel.multiline !== value) {
				viewModel.multiline = value;
				changed = true;
			}
		});
		this.bulkUpdate = false;
		if (changed) {
			this._onDidChange.fire(undefined);
		}
	}