Appending server URL add https:// prefix all the time

In New Connection dialog is validation on server text field (server URL). In case of invalid input, the "https://" prefix is added and then typed text is appended. This works in case if user clear text field and start type server without https:// prefix. But if user start type "http" and then add instead of "s" letter "a", this whole goes as appendix to suffix "https://". It results into string "https://httpa".

The real problem begin, once I have any valid URL, e.g. "https://locahost:8443" and I start typing somewhere into substring "https://". Let's say I type letter "x" to get "httpsx://localhost:8443". It results into new server URL "https://httpsx://localhost:8443". And this repeats again and again.