Weird behavior when trying to type @ character

[eddex]

I tried to type an email and used ALTGR+2 (CH-DE keyboard) to write an @.

Expected: An @ appears at the current cursor position.

Actual: ?@ appears on the current cursor position.

In addition, any subsequent keyboard input not only writes a character on the current cursor position but also duplicates the first character of the current line.

[ktr0731]

Thank you for reporting an issue.
What is your terminal environment?

[eddex]

• OS Windows 10
• Terminal: PowerShell and cmd.exe

The issue also happens with any other special characters combined with the ALTGR key.

[acomagu]

I can reproduce with Alt key. Alt + any character(e.g. Alt+a) causes same display destruction also on my machine.

• PowerShell 5.1
• WindowsTerminal 1.13

I assume it's same cause of AltGr's.

Maybe related?

• [Bug] Emojis break suggestion block width / positioning c-bata/go-prompt#209
• Fix: some emoji could not be gotten in WindowsTerminal 1.5 mattn/go-tty#42

Other programs, like Bash, simply ignore Alt+character, but Evans(maybe all CLIs using go-prompt?) doesn't. So I feel the good first step is to investigate why Evans can't ignore Alt+character on Windows.