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Live incident, root-caused jointly with the AGS peer session: creating a
fake monitor visibly shrank the real primary output's usable area
(full_y stayed 0 throughout - its true position never moved) each time,
tracking almost exactly one bar height per fake monitor created.
create_virtual_head registered its new Output in udev.virtual_heads but
never in CompState::outputs, the list output_for_wl searches to resolve
a client-named wl_output back to anything. new_layer_surface's own
fallback for an output it can't resolve is landing on the primary output
- so AGS's own per-monitor bar, aimed at the fake monitor it reasonably
believed was a new real one, silently landed on the real primary output
instead, stacking its own exclusive-zone reservation on top of the real
bar already there. Two fake monitors, two misrouted bars, two zone
increments, matching the observed climb exactly.
Fixed by registering (and, on removal, deregistering) a virtual head's
Output in CompState::outputs the same way bring_up_head already does for
a real one. Also adds Monitor::is_virtual / MonitorInfo's "virtual" JSON
field, requested directly by the AGS peer session as the real
discriminator their own temporary FAKE- name-pattern match was standing
in for.
The X-position half of this same incident was AGS's own remembered-
layout restore treating a fake monitor's wl_output as a real hotplug --
already fixed on their side (readArrangeable() now filters split/virtual
outputs).
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Two independent pieces landed together this pass - both real, both
scoped, see docs/TODO.md for the full narrative on each:
Fake monitors: a genuinely independent, additional wl_output with no DRM
connector/CRTC behind it at all - distinct from srd.monitor.split
(divides one real output's own placement rectangle). Researched niri's
own Headless backend first (cloned at ~/reference-wms/niri): its render()
never actually composites anything, a no-render stub for that project's
test suite only. This one is real: it renders whatever is placed on it,
on demand, whenever a zwlr_screencopy_manager_v1 client asks for a frame.
New crates/wayland/src/udev/virtual_heads.rs (create/remove a real Output
+ global, render-on-demand for screencopy, integrated into platform.rs's
monitors() as a genuine srdwm_core::Monitor so core placement/workspace
code needs zero special-casing). New IPC/CLI: srd dispatch create
fake-monitor <name> <w>x<h> / remove fake-monitor <name>. Core-side
request queue in crates/core/src/manager/fake_monitor.rs.
Placement bug, root-caused and fixed: every new window opened alone
landed in the exact same spot, "not at all like Windows" (reported live).
SmartPlacement::place tried a grid cell first, and grid's own cell count
is existing.len() + 1 - with nothing else open (opening one app at a
time, the ordinary case), that's always 1, so a 1x1 grid returns the same
single cell forever regardless of session history. Cascade had the same
bug in a second form (its own step was existing.len() % max_steps, also
always 0 with nothing open). Fixed: WindowManager::next_cascade_step (a
Cell - add_window's own target_monitor stays borrowed across the call)
advances on every real placement and is never reset by a window closing;
place() now skips grid entirely when nothing else is open, going
straight to cascade, since grid's real job (dividing space among
concurrent windows) has nothing to divide when there's no concurrency.
Full workspace build/test/clippy clean (223 core / 141 wayland / 29
platform / 24 ctl / 28 config / 10 x11 tests, 0 failed, 0 clippy
warnings), built and installed.
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