src/vs/workbench/services/label/common/labelService.ts/ResourceLabelFormattersHandler/constructor
class ResourceLabelFormattersHandler:	constructor(@ILabelService labelService: ILabelService) {
		resourceLabelFormattersExtPoint.setHandler((extensions, delta) => {
			delta.added.forEach(added => added.value.forEach(formatter => {
				if (!isProposedApiEnabled(added.description, 'contribLabelFormatterWorkspaceTooltip') && formatter.formatting.workspaceTooltip) {
					// workspaceTooltip is only proposed
					formatter.formatting.workspaceTooltip = undefined;
				}
				this.formattersDisposables.set(formatter, labelService.registerFormatter(formatter));
			}));
			delta.removed.forEach(removed => removed.value.forEach(formatter => {
				this.formattersDisposables.get(formatter)!.dispose();
			}));
		});
	}