Avoids multiple web requests for visibility

src/env/node/git/localGitProvider.ts

@@ -571,6 +571,7 @@ export class LocalGitProvider implements GitProvider, Disposable {
 			: [RepositoryVisibility.Private, getVisibilityCacheKey(remotes)];
 	}
 
+	private _pendingRemoteVisibility = new Map<string, ReturnType<typeof fetch>>();
 	@debug<LocalGitProvider['getRemoteVisibility']>({ args: { 0: r => r.url }, exit: r => `returned ${r[0]}` })
 	private async getRemoteVisibility(
 		remote: GitRemote,
@@ -589,14 +590,22 @@ export class LocalGitProvider implements GitProvider, Disposable {
 				if (url == null) return [RepositoryVisibility.Private, remote];
 
 				// Check if the url returns a 200 status code
+				let promise = this._pendingRemoteVisibility.get(url);
+				if (promise == null) {
+					promise = fetch(url, { method: 'HEAD', agent: getProxyAgent() });
+					this._pendingRemoteVisibility.set(url, promise);
+				}
+
 				try {
-					const rsp = await fetch(url, { method: 'HEAD', agent: getProxyAgent() });
+					const rsp = await promise;
 					if (rsp.ok) return [RepositoryVisibility.Public, remote];
 
 					Logger.debug(scope, `Response=${rsp.status}`);
 				} catch (ex) {
 					debugger;
 					Logger.error(ex, scope);
+				} finally {
+					this._pendingRemoteVisibility.delete(url);
 				}
 				return [RepositoryVisibility.Private, remote];
 			}