extensions/markdown-language-features/src/languageFeatures/diagnostics.ts/DiagnosticManager/triggerDiagnostics
class DiagnosticManager:	private async triggerDiagnostics(uri: vscode.Uri): Promise<void> {
		this.inFlightDiagnostics.cancel(uri);

		this.pendingDiagnostics.add(uri);
		return this.reporter.addWorkItem(
			this.diagnosticDelayer.trigger(() => this.recomputePendingDiagnostics())
		);
	}