libweston-desktop: Add shell capability queries
[based on !769 (merged) as that also needs to bump wayland-protocols to v1.26]
Allow other components to query which window-management operations are supported by the shell.
Edited by Daniel Stone
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[based on !769 (merged) as that also needs to bump wayland-protocols to v1.26]
Allow other components to query which window-management operations are supported by the shell.