src/vs/workbench/contrib/search/browser/searchWidget.ts/SearchWidget/onContextLinesChanged
class SearchWidget:	private onContextLinesChanged() {
		this._onDidToggleContext.fire();

		if (this.contextLinesInput.value.includes('-')) {
			this.contextLinesInput.value = '0';
		}

		this._onDidToggleContext.fire();
	}