Update slider for border radius

[ahoneybun]

This adds the option to change the border radius for the dock and panel.

[edfloreshz]

It works, however, the elements inside the panel are not changing their border radius.

[ahoneybun]

It works, however, the elements inside the panel are not changing their border radius.

It is for the outside of the panel not inside and I believe that is the same for the dock.

[edfloreshz]

Yes, but the panel ends up looking like this:

The border radius should also apply to the elements inside it, that's what cosmic-settings does.

[ahoneybun]

Do we want to remove the option for the panel and only for the dock? COSMIC Settings does not show this option so I figured it was good for Tweaks for COSMIC.

[edfloreshz]

Yeah, the option is great, we should just try to fix the issue before merging.

[ahoneybun]

Is it an upstream issue or an us issue though?

[edfloreshz]

It's an us issue as far as I can tell, you can look into cosmic-settings to see how the app updates the radius and replicate that here.

[ahoneybun]

I don't see that option in Settings, is it just for the panel there?

[edfloreshz]

This option changes the border radius of both the panels and the widgets.