I have an application that binds a menu item to trigger on ⌘]. When I set the US input source, I press ⌘] in order to trigger that item. However, when I switch the input source to QWERTZ (German), the trigger changes to ⌘Ä automatically by the OS. It seems to translate keystrokes for different input sources.
The problem is that I also render the keybindings in a window in my application, and my application is not aware of this translation. Furthermore, I have other key shortcuts in my application which are not bound to menu items, and I want to make sure those get translated too.
Does AppKit expose a way to lookup what a keystroke will be when MacOS translates it, i.e. lookup ⌘Ä from ⌘] when the current layout is QWERTZ? I can't find anything in Apple's docs.
I tried converting a character to virtual key code based on the US layout and then mapping it back to a character based on the QWERTZ layout. That doesn't seem to be the same b/c that ends up converting ] to + instead which seems to be based on physical key location, different from how the keybindings are handled.
Update: I notice similar behavior for VS Code's menu bar, e.g. in their "Terminal" menu. Switching to German changes some bindings. This does not occur at all in iTerm's menu bar, I suspect b/c their menu items are specified in a different way, xib files with hard-coded key equivalents