Sidebar Gtk4 Prep

[danirabbit]

Starting over based on changes from #2082

I think this is The Least™ to make sure these don't subclass ListBox without any errors or warnings in terminal etc

SidebarInterface, SidebarWindow

• Remove unused remove_item_by_id

SidebarItemInterface

• subclasses Object rather than Gtk.Widget

SidebarListInterface

• subclasses Object rather than Gtk.Widget
• remove unused remove_bookmark_by_uri
• Use Gtk.ListBoxRow instead of SidebarItemInterface where possible to avoid issues with pointers/casting
• Misc code style

BookmarkListBox, DeviceListBox, NetworkListBox

• Subclass Box, ListBox is a child
• Use Gtk.ListBoxRow instead of SidebarItemInterface where possible to avoid issues with pointers/casting
• Misc code style

[jeremypw]

You can reduce the diff by reverting changes to the clear () function. Otherwise everything seems to work as before.

[jeremypw]

Holding until after release of version 6.5.0