Links with no authority are considered invalid (microsoft#189323)

* edit validateLink

Author: MeghanKulkarni

extensions/markdown-language-features/src/languageFeatures/copyFiles/copyPasteLinks.ts

@@ -57,7 +57,7 @@ export function validateLink(urlList: string): { isValid: boolean; cleanedUrlLis
 	}
 	const splitUrlList = trimmedUrlList.split(' ').filter(item => item !== ''); //split on spaces and remove empty strings
 	if (uri) {
-		isValid = splitUrlList.length === 1 && !splitUrlList[0].includes('\n') && externalUriSchemes.includes(vscode.Uri.parse(splitUrlList[0]).scheme);
+		isValid = splitUrlList.length === 1 && !splitUrlList[0].includes('\n') && externalUriSchemes.includes(vscode.Uri.parse(splitUrlList[0]).scheme) && !!vscode.Uri.parse(splitUrlList[0]).authority;
 	}
 	return { isValid, cleanedUrlList: splitUrlList[0] };
 }

extensions/markdown-language-features/src/test/markdownLink.test.ts

@@ -94,6 +94,11 @@ suite('createEditAddingLinksForUriList', () => {
 			const isLink = validateLink('https://www.microsoft.com/    \r\nhttps://www.microsoft.com/\r\nhttps://www.microsoft.com/\r\n hello \r\nhttps://www.microsoft.com/').isValid;
 			assert.strictEqual(isLink, false);
 		});
+
+		test('Markdown pasting should not occur for just a valid uri scheme', () => {
+			const isLink = validateLink('https://').isValid;
+			assert.strictEqual(isLink, false);
+		});
 	});
 
 	suite('appendToLinkSnippet', () => {