Apparently some phones (at least some from Samsung) don't expose the
system file manager in the system settings despite it being the
only on-device file manager that can open app-specific directories...
This enables scoped storage for new Dolphin installs on Android 11
and up (along with a few other changes in behavior which unlike
scoped storage are uncontroversial). Existing installs are unaffected.
We have to do this in order to be able to release updates on
Google Play from November 2021 and on.
The following settings are currently not SAF compatible,
and might never be due to the performance impact:
Dump Path
Load Path
Resource Pack Path
Wii NAND Root
This commit makes us show a message to the user if they try to
change one of these settings while scoped storage is active.
I don't want to entirely remove the settings from being listed
in the settings activity, because it's important that the user
is able to reset them if they were set to something custom in
a previous version of Dolphin.
This lets Dolphin function without the user granting access to
external storage. We need this for scoped storage compatibility.
When scoped storage is not active, we still ask for permission to
access external storage the first time the app is started so that
we can use the existing dolphin-emu folder if there is one. But
if it doesn't exist, or the user denies the permission, or scoped
storage is active, the app-specific directory will be used instead.
Special shoutout to Android for not having RTL compatible
variants of nextFocusRight and nextFocusLeft.
Ideally we would have some way to block the user from using
the d-pad to switch between the two panes when in portrait mode,
or make the list pane act as if it's to the left of the details
pane rather than the right when the details pane is open, but I
don't know of a good way to do this. SlidingPaneLayout doesn't
really seem to have been implemented with d-pad navigation in mind.
Thankfully, landscape is the most important use case for gamepads.
The way I'm implementing events using LiveData feels rather
unorthodox, but I'm not aware of anything in the Android framework
that would let me do it in a better way... One option I did
consider was wrapping the cheat lists in LiveData and observing
those, but then CheatsAdapter wouldn't know which cheat had
changed, only that there was some kind of change to the list,
necessitating the use of the not recommended notifyDataSetChanged.
