Start button mapping not working

[50J0uRNeR]

Bug report

Describe the bug

Here is a clear and concise description of what the problem is:

The start button does not work in emulator.

RetroArch Behavior

Here is a clear and concise description of what happens in RetroArch with the same core/game:

I've only tested in Kodi 19.
I assume the start button works in RetroArch.

To Reproduce

Steps to reproduce the behavior:

1. Run a game that requires the start button (such as Mario 64).
2. Press the start button and nothing will happen.

Debuglog

The debuglog can be found here:
No log necessary.

Screenshots

Here are some links or screenshots to help explain the problem:

No screenshots necessary.

Your Environment

Used Operating system:

• Android
• iOS
• Linux
• OSX
• Raspberri-Pi
• Windows
• Windows UWP

Operating system version/name:
Raspbian GNU/Linux 11 (bullseye)

Kodi version:
Kodi 19 Matrix
debian package 2:19.3-1-bullseye

Emulator:
Compiled from https://github.com/libretro/mupen64plus-libretro-nx/archive/b76ea63eeeba4c3b0364504a7cea01f1b826c3ae.tar.gz

My Solution

It appears that the start button has not been entered into the buttonmap.xml file.
The follow patch to buttonmap.xml has been tested and fixes the issue...

--- orig/game.libretro.mupen64plus-nx/resources/buttonmap.xml   2022-02-15 20:51:27.167136473 -0500
+++ repo/game.libretro.mupen64plus-nx/resources/buttonmap.xml   2022-02-15 20:50:39.276842520 -0500
@@ -7,6 +7,7 @@
                <feature name="cdown" mapto="RETRO_DEVICE_INDEX_ANALOG_RIGHT" direction="down"/>
                <feature name="cright" mapto="RETRO_DEVICE_INDEX_ANALOG_RIGHT" direction="right"/>
                <feature name="cleft" mapto="RETRO_DEVICE_INDEX_ANALOG_RIGHT" direction="left"/>
+                <feature name="start" mapto="RETRO_DEVICE_ID_JOYPAD_START"/>
                <feature name="up" mapto="RETRO_DEVICE_ID_JOYPAD_UP"/>
                <feature name="down" mapto="RETRO_DEVICE_ID_JOYPAD_DOWN"/>
                <feature name="right" mapto="RETRO_DEVICE_ID_JOYPAD_RIGHT"/>

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