extensions/markdown-language-features/src/languageFeatures/diagnostics.ts/DiagnosticCollectionReporter/getTabResources
class DiagnosticCollectionReporter:	private getTabResources(): ResourceMap<void> {
		const openedTabDocs = new ResourceMap<void>();
		for (const group of vscode.window.tabGroups.all) {
			for (const tab of group.tabs) {
				if (tab.input instanceof vscode.TabInputText) {
					openedTabDocs.set(tab.input.uri);
				}
			}
		}
		return openedTabDocs;
	}