[Android] Analog issues - Diagonal movements with a controller don't work properly

[greencowpat]

So, I'm using a ps4 controller on my android tablet with PPSSPP version v0.9.9.1.
What I believe the issue boils down to is: "PSP analog range is a square; controller range is a circle"

Diagonal movements can't fully register because of the psp's square analog movement radius.
This means that you can only do 3/4 of the max diagonal input with a controller, which causes gamplay issues (moves don't work, characters keep walking)

The issue has been brought up before in the forums:
/showthread.php?tid=12601
/showthread.php?tid=12915

There were also some tickets on github about it:
/hrydgard/ppsspp/issues/1360
/hrydgard/ppsspp/pull/1320

Has anyone else had this issue and know of a fix? Hopefully we can get some dev input.