[Bug 51922] HID joystick constant Force Feedback effect does not work

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51922

--- Comment #18 from Rémi Bernon  ---
Thanks, as far as I could see in the hid-pidff Linux driver, they always send
the two condition reports, regardless of their value. From the DInput MSDN
documentation, it is mentioned that when only one condition is set, it's
supposed to be used for all axes (with supposedly the direction applied to
modulate the effect, but I didn't find any clue that it's true).

Maybe what we need to do for the SDL and evdev backends is to copy the first
condition onto the second one when there's only one, so that the underlying
drivers never send empty conditions.