src/vs/workbench/contrib/tasks/common/problemCollectors.ts/AbstractProblemCollector/cleanAllMarkers
class AbstractProblemCollector:	protected cleanAllMarkers(): void {
		this.resourcesToClean.forEach((value, owner) => {
			this._cleanMarkers(owner, value);
		});
		this.resourcesToClean = new Map<string, Map<string, URI>>();
	}