pad: Don't throw on socket.io error

CHANGELOG.md

@@ -41,6 +41,7 @@
 ### Notable fixes
 
 * Enter key now stays in focus when inserted at bottom of viewport.
+* Suppressed benign socket.io connection errors
 * Interface no longer loses color variants on disconnect/reconnect event.
 * Removed npm.load to support npm7.
 * General code quality is further significantly improved.

src/static/js/pad.js

@@ -271,7 +271,9 @@ const handshake = () => {
       pad.collabClient.setStateIdle();
       pad.collabClient.setIsPendingRevision(true);
     }
-    throw new Error(`socket.io connection error: ${JSON.stringify(error)}`);
+    // Don't throw an exception. Error events do not indicate problems that are not already
+    // addressed by reconnection logic, so throwing an exception each time there's a socket.io error
+    // just annoys users and fills logs.
   });
 
   socket.on('message', (obj) => {