It seems like the menu isn't showing up for users on Android 13.
We're not sure what's wrong, and the approach we've been using for the
menu hasn't been entirely reliable in the past either (in particular
not on non-mobile form factors like Chromebooks and VR devices),
so let's make it possible to open the menu by pressing Back,
an action that works reliably on most kinds of Android devices.
(Not sure if there's an equivalent of Back on devices like watches,
but I think we can pretty safely ignore those for now.)
This prevents the keyboard from being stuck in an open state if the user
slides the panel while focused on a text box. Now it closes gracefully.
Co-authored-by: Charles Lombardo <clombardo169@gmail.com>
The JNI functions that have "UTF" their name use "modified UTF-8"
rather than the standard UTF-8 that Citra uses, at least according
to Oracle's documentation, so it is incorrect for us to use them.
This change fixes the problem by converting between UTF-8 and
UTF-16 manually instead of letting JNI do it for us.
