settings: Read config "onscreen-keyboard"

[Jakko3]

The config option "onscreen-keyboard" takes no effect because it doesn't get read out. Add the missing read-out.

Fixes: #219

[mtwebster]

I still don't think this is necessary - once I enable the keyboard via the accessibility menu, it stays enabled for me even across reboots -

When the menu item is toggled, the gsettings value is updated.

This never gets overridden by any other settings (because it isn't part of the bool_keys).

Please check again on your end, whether or not this setting resets at a reboot. I'm not against a visible setting if necessary, but if the menu item selection is persistent, it seems the most consistent (none of the other accessibility menu options are individually configurable either).

[clefebvre]

I like the way it works for users right now. The readme could be clearer though for distros trying to overwrite the default.

[Jakko3]

The gsettings set by user "lightdm" are currently not persistent over reboots in postmarketOS (based on Alpine Linux). Might be a permission issue in Alpine Linux. See comment #219 (comment).

If the accessibility checkbox for the onscreen keyboard is considered to be sufficient, the non-working slick-greeter setting "onscreen-keyboard" needs to be removed (from readme, manpage, gschema, etc.). Btw. the rather new setting "onscreen-keyboard-layout" is missing in readme and manpage.

I still would advertise for making the setting "onscreen-keyboard" work in the config file and additionally add it to lightdm-settings, as proposed in linuxmint/lightdm-settings#62. My intension is not about accessibility, it's about improving the handling for touch devices, which get used more and more also in classic Linux environments. Of course the choice is yours.