Fix workspace state updates so panels such as sfwbar can correctly
track workspace-filtered taskbars under labwc.
- remove restriction that skips workspace updates when the source is OSD
- trigger output_update_workspace_appearance() after workspace change
- return early when no view is present to avoid inconsistent updates
This resolves incorrect behavior where sfwbar (filter = workspace)
does not update properly under labwc, while it works correctly on sway.
Related: https://github.com/LBCrion/sfwbar/issues/412
Currently, the dependencies between foreign-toplevel[-internal],
ext-foreign, and wlr-foreign are cyclical and a bit complex.
I suggest we reorganize it into a simpler hierarchy:
foreign-toplevel/
-> foreign.c/h
-> (depends on) ext-foreign.c/h
-> (depends on) wlr-foreign.c/h
The refactored code is smaller and (IMO) easier to follow.
In detail:
- Add include/foreign-toplevel folder mirroring src/foreign-toplevel
- Split foreign-toplevel-internal.h to ext-foreign.h and wlr-foreign.h
- Eliminate ext-/wlr-foreign.c -> foreign.c reverse dependencies
(including internal signals and foreign_request* functions)
- Make struct foreign_toplevel private to foreign.c
Lightly tested with qmpanel (which uses wlr-foreign-toplevel).
v2: reorder foreign-toplevel internal API funcs
