Semicolon ';' recognized as a plus sign '+' when setting key binding from Japanese keyboard layout.

• iTerm2 version:3.3.9
• OS version: macOS Catalina 10.15.2
• com.googlecode.iterm2.plist

Detailed steps to reproduce the problem:

1. Make sure your keyboard is in a JIS layout.
2. Preferences > Key Bindings > + button to add new Key Combination > Record cmd + shift + ;
3. During the recording, semicolon shows up properly. But once you click "OK", ; turns into + and is recorded as a key binding.
4. This happens whether the Emulate U.S. Keyboard option is enabled or not.

What happened: JIS keyboard has a different layout from the U.S. (ANSI) keyboard layout. ; and + share the same key. So to input + you need to press shift + ;. It seems that this caused a problem when recording the shortcut.

What should have happened: It should properly recognize semicolon and not turn it into a plus sign.