Abstract resuming the authentication

We now do this in multiple places, so make sure things are handled the
same way in all cases.

core/rfb.js

@@ -402,7 +402,7 @@ export default class RFB extends EventTargetMixin {
 
     sendCredentials(creds) {
         this._rfbCredentials = creds;
-        setTimeout(this._initMsg.bind(this), 0);
+        this._resumeAuthentication();
     }
 
     sendCtrlAltDel() {
@@ -1661,7 +1661,7 @@ export default class RFB extends EventTargetMixin {
         this._rfbCredentials.ardCredentials = encrypted;
         this._rfbCredentials.ardPublicKey = clientPublicKey;
 
-        setTimeout(this._initMsg.bind(this), 0);
+        this._resumeAuthentication();
     }
 
     _negotiateTightUnixAuth() {
@@ -2052,6 +2052,14 @@ export default class RFB extends EventTargetMixin {
         }
     }
 
+    // Resume authentication handshake after it was paused for some
+    // reason, e.g. waiting for a password from the user
+    _resumeAuthentication() {
+        // We use setTimeout() so it's run in its own context, just like
+        // it originally did via the WebSocket's event handler
+        setTimeout(this._initMsg.bind(this), 0);
+    }
+
     _handleSetColourMapMsg() {
         Log.Debug("SetColorMapEntries");