Left and right modifier keys mirrored on Mac OS X 10.14.5 (Mojave) as host

[Lars]

Repro steps:

1. Connect external keyboard
2. Under System Preferences --> Keyboard --> Keyboard --> Modifier Keys

Change option to command and command to option

3. Start VirtualBox
4. Under Preferences --> Input --> Virtual Machine

Set "Host Key Combination" press command + option to the left Note: it says right command + right option

Impact: on Windows guest running a non US keyboard, e.g. Swedish layout, the option key is now alt gr and not alt

Same thing on 5.2.30

Might be something in Mac OS which also affect Emacs: ​http://emacs.1067599.n8.nabble.com/bug-34984-ns-right-command-modifier-has-influence-to-left-td478781.html

[Michael Thayer]

The link you provided suggested that this is a macOS problem which should be reported to Apple.