Fix negative offset of reconnect delay (#8718) (#8719)

RTDB Fix negative offset of reconnect delay. Fixes #8718.

Author: alexander-at-t

.changeset/chilled-clocks-remember.md

@@ -0,0 +1,6 @@
+---
+"@firebase/database": patch
+'firebase': patch
+---
+
+Fix a potential for a negative offset when calculating last reconnect times. This could cause lengthy reconnect delays in some scenarios. Fixes #8718.

packages/database/src/core/PersistentConnection.ts

@@ -797,8 +797,10 @@ export class PersistentConnection extends ServerActions {
         this.lastConnectionEstablishedTime_ = null;
       }
 
-      const timeSinceLastConnectAttempt =
-        new Date().getTime() - this.lastConnectionAttemptTime_;
+      const timeSinceLastConnectAttempt = Math.max(
+        0,
+        new Date().getTime() - this.lastConnectionAttemptTime_
+      );
       let reconnectDelay = Math.max(
         0,
         this.reconnectDelay_ - timeSinceLastConnectAttempt