middle click emulation setting with left&right click doesn't get applied to trackballs at boot

Distribution

linux mint 22

Package version

6.2.9

Graphics hardware in use

No response

Frequency

Always

Bug description

I have a Logitech M570 trackball. When I enable 'enable middle click emulation by clicking both left and right buttons' option it works initially. But setting isn't applied when I reboot my system. I can make it work by toggling the setting but it doesn't work at next reboot.

Steps to reproduce

Attach a trackball. Enable 'middle click emulation' feature from the mouse settings panel. Reboot the system.

Expected behavior

Middle click emulation setting should be respected after reboot.

Additional information

I did some code reading, and noticed that there is a separate 'directory' in gsettings for trackballs. When I set middle click emulation for the trackball with dconf, everyhing works as expected.

dconf write /org/cinnamon/desktop/peripherals/trackball/middle-click-emulation true

Here is my guess: at startup, settings for 'peripherals/mouse/*' are not applied to 'trackball' devices. But when 'middle-click-emulation' option is toggled in the interface, relevant hook in the backend doesn't care for the device type and applies the setting to the trackball devices as well. And it works. I think a potential quick solution is to store the relevant mouse options also for 'trackball' gsettings directory until there is a separate interface for modifying 'Trackball' settings.

Start by tracing how the mouse settings panel stores and applies middle-click emulation during startup, comparing the mouse and trackball GSettings paths shown in the report. Confirm the fix by enabling the option for a trackball, rebooting Linux Mint, and verifying that middle-click emulation remains active without toggling the setting.