Add Configuration of debug panel shows wrong suggestions when a new websocket is created

[tom-shan]

Description

After the websocket connection is recreated for network problems, clicking Add Configuration of debug panel will only show some useless suggestions.
This problem appears frequently because of my bad network and is very annoying.

right suggestions

wrong suggestions after a new websocket is created

Reproduction Steps

This issue may be difficult to reproduce in reliable networks, so I use iptables to cut the network connection between the server and client as follows:

#/bin/bash
iptables -I INPUT -p tcp -s {client ip} --dport {connection port} -j DROP
sleep 20
iptables -D INPUT 1

The sleep time should be long enough, otherwise the old websocket connection will be reused and the problem will not be reproduced.
OS and Theia version:
os: centos 7
theia commit id: 1808d78
Diagnostics:

[akosyakov]

@tom-shan Do you use VS Code extensions for node.js debugging?

[tom-shan]

@tom-shan Do you use VS Code extensions for node.js debugging?

No, I did not use any vscode extension.

[akosyakov]

It's a regression since restart skips now if a server is not running, but it does not play nicely with reconnection. I will do a PR promptly. cc @AlexTugarev