Someone reported that their (apparently) Huion H950p tablet is detected by SDL
as a game controller, and unfortunately it seems to report a stylus position of
0,0 by default which SDL interprets as up-left (minimum possible value in the
first two axes). They mentioned that other games like Super Tux Kart don't have
this problem.
SDL doesn't have this device in its controller DB, it's just reporting a
detected device so I think it's up to us to filter out devices like this.
Something I've wanted to do is ignore input from controllers/joysticks which
has been constant since the device was detected. This is actually a fairly
common problem, also occurring when a gamepad has a stuck key (or is lying
facedown somewhere). Also, the fact that we accept input from any
controller/joystick on the system makes us quite susceptible to this.
The debug log shows the tablet is detected as 2 USB devices, a "Pad" and a
"Touch Strip", so SDL really does think it's a gamepad?
Note that the "dylib_noload(libSDL2.so) failed" message means we couldn't call
and report the output of `SDL_GameControllerTypeForIndex`.
```
0.0 Initialising gfx_sdl2...
0.0 ! dylib_noload(libSDL2.so) failed. Continuing
0.7 setvideomode zoom=2 w*h = 640,400
1.0 gfx_sdl2 SDL 2.30.0 (3 joysticks) Driver: x11 Render driver: opengl //
gfx_sdl2 Drivers: x11 wayland KMSDRM offscreen dummy evdev Render Drivers:
opengl (hwaccel,vsync,textarget) opengles2 (hwaccel,vsync,textarget) software
(vsync,textarget)
...
1.0 Joystick 0 GUID 030072e66c2500006d000000110100 instance_id 0
1.0 Opened as gamecontroller HID 256c:006d Pad
1.0 030072e66c2500006d00000011010000,HID 256c:006d
Pad,a:b0,b:b1,leftx:a0,lefty:a1,crc:e672,platform:Linux
1.0 Opened joystick 0 HID 256c:006d Pad (id 0) -- 14 buttons 2 axes 0 hats 0
balls
1.0 Joystick 1 GUID 03000d6e6c2500006d000000110100 instance_id 1
1.0 Opened as gamecontroller HID 256c:006d Pad
1.0 03000d6e6c2500006d00000011010000,HID 256c:006d
Pad,a:b0,b:b1,leftx:a0,lefty:a1,crc:e672,platform:Linux
1.0 Opened joystick 1 HID 256c:006d Touch Strip (id 1) -- 1 buttons 4 axes 0
hats 0 balls
```
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