client-toolkit/toplevel-info: Work with only ext foreign toplevel #49
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This makes `foreign_toplevel` in `ToplevelInfo` no longer an `Option`. Cosmic-comp has supported version 2 of this protocol for a while, so supporting version 1 is no longer necessary.
With this, `toplevel-monitor` works on Sway, but doesn't have the information exposed through the Cosmic protocol, naturally. The API is changed to use `ExtForeignToplevelHandleV1`. For convenience, `ToplevelInfo` contains the foreign handle, and the optional cosmic handle. I assume `identifier` is meant to be mandatory, so that is no longer an `Option` here. Though there's no check that the server sends this (is server-side code, this would send a protocol error; I guess cctk could panic, or log an error.)
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Supporting both cosmic toplevel info version 1 and foreign toplevel list (with cosmic toplevel info) seems awkward. So this initially make the cosmic-protocol mandatory and the ext protocol optional (without breaking the API). But now that Cosmic has supported this for a while, lets drop client-side support for the old version, and add support for other compositors implementing
ext-foreign-toplevel-list-v1.I still need to update users of the library for this. Probably after #46. Looks like
ext_foreign_toplevel_image_capture_source_manager_v1isn't currently implemented by Sway? So this doesn't yet capture windows on Sway.