macOS Guest: When Use Trackpad is enabled from UTM.app GUI, it is not saved in config.plist

[runwaygoats]

Describe the issue
When Use Trackpad is enabled from UTM.app GUI, it is not saved in config.plist
When I add it manually to config.plist file as below, the setting is kept until I made another change and save from UTM.app GUI.

            <key>Trackpad</key>
            <true/>

Configuration

• UTM Version: 4.3.0 (82)
• macOS Version: 13.4
• Mac Chip (Intel, M1, ...): M1 Max

[F1248]

I cannot contribute to the solution of the problem, but I can confirm that I have the same problem:
MacBook Air M1, macOS 13.4, UTM 4.3.0 (82)

[nitinseshadri]

I am having the same issue and I think I know why it is happening.

In UTMAppleConfigurationVirtualization.swift, the developers forgot to encode the Trackpad preference when saving. The following line should be added to func encode(to encoder: Encoder):

try container.encodeIfPresent(hasTrackpad, forKey: .hasTrackpad)