Issue with sharp protocol on ite-cir due to high idle timeout

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Hi Sean,

yesterday we received an interesting bug report that might
help to motivate using a lower idle timeout on ite-cir:

https://forum.libreelec.tv/thread/11951-sharp-ir-remote-on-intel-nuc-2820-double-presses/

The rather long message time of the sharp protocol (about 86ms)
in combination with the 200ms default idle timeout of ite-cir
leads to the last message being received after the current 250ms
"keyup" timeout. This results in an additional keyup/keydown
event being generated from the last message. Even a short button
press results in 2 keydown events.

I dont't have any ite-cir hardware here but could reproduce it
with gpio-ir-recv set to 200ms idle timeout. Lowering the
timeout to 100 or 125ms fixed the issue both here and on the
reporter's hardware.

so long,

Hias



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