Records what was measured this pass and, as importantly, what was not.
KGlobalAccel will accept a bare Escape and its component carries both a
pressed and a released signal, so hold-and-cancel is expressible. What
could not be measured here is whether a global shortcut takes the key
away from applications, because key injection cannot reach the nested
session. The mechanism says it does — KWin matches shortcuts in an input
filter ahead of the focused surface — which would cost the classroom
every ordinary use of Escape. That is inference, and it is written down
as inference, with the thirty-second bench test that settles it.
The recommendation is to change the gesture rather than grab the key an
appliance uses most: hold-to-confirm on an on-screen control, which is
ordinary Qt inside our own surface, or a modifier chord like the one the
maintenance terminal just proved. Either keeps the deliberate ceremony
without an input daemon.
Co-Authored-By: Claude Opus 5 <[email protected]>
Three things in this window that a container cannot answer, and they are
now the top of the next-steps list: a real key pressed into Parent Call,
a television switched on after the computer, and a disc that plays.
Also brings the comments in the shared libraries up to date. The only
mention of sway left in the tree is the upgrade step that removes the
sway-era login shell from a room being upgraded.
Co-Authored-By: Claude Opus 5 <[email protected]>
Run against the lab as the package built it, not a session edited by
hand. The panel came back from eight SIGKILLs a second apart in about
2.2s each time, the compositor in 0.1s, the audio policy from three, and
neither Parent Call nor the browser dying disturbed the panel.
Co-Authored-By: Claude Opus 5 <[email protected]>
The DVD player was the only thing still speaking a compositor the room
no longer runs. It asked sway's tree whether VLC's window had really
gone fullscreen, because VLC reports playing while its window is still
the black startup one the loading cover exists to hide.
VLC's own status was measured as a replacement and is not one: it
reports fullscreen true in the same 250ms poll as playing, because the
flag is the option it was started with and not a report about its
window. So the cover is held for a floor and capped by the deadline that
was already there, and the compositor is not asked anything.
Focus-or-launch went the same way. The session already takes an
exclusive lock, so a second one cannot start, and bringing an existing
one to the front is the panel's job.
classroom-window, classroom_sway and classroom_chrome are gone with it —
the last of them was reachable from nothing at all.
DVD also moves out of the status row, where it sat beside the clock as
though a disc were a machine reading. It is an application: it is in the
row with Wonder Ink and the browser, and classroom-provision removes it
from the layout on a machine with no optical drive, which retires
DVD_ENABLED. A computer that moves between rooms takes its drive with
it; nobody remembers to edit a file when it does.
The panel is rebuilt from the package at every login now. Plasma keeps
whatever panel it first built, so an update could change the bar in the
package and never change it in a room — measured, with an icon that
outlived the file it came from. Editing the live panel configuration was
tried instead and destroyed the panel, because the shell owns that file.
Removing it before the shell starts is safe and makes the desktop
stateless.
Co-Authored-By: Claude Opus 5 <[email protected]>
The install list loses the dock, the window helper, the Chrome window
arbiter, the notification wrapper, the compositor and bar configs and the
GTK icon and stylesheet machinery, and gains a look and feel package, a
colour scheme, window rules, Kiosk restrictions and two supervised user
services. Dependencies follow: Plasma and SDDM in, sway, waybar, mako and
gtk-layer-shell out.
Co-Authored-By: Claude Opus 5 <[email protected]>
The room that prompted this had a television on HDMI with working PCM
audio and nothing in the analog jack, and WirePlumber chose analog. A
teacher who corrected it by hand then had to restart the browser before
any sound came out.
The policy is a pure function so it can be tested against that room
rather than against a machine: an unavailable port is not a candidate,
an analog port merely existing is not evidence of a cable, and an
explicit AUDIO_OUTPUT overrides the lot. Twelve cases, the real room
among them.
The daemon follows PipeWire's own event stream rather than polling, and
moves streams that are already playing, which is the part that stops a
teacher having to close and reopen the browser.
Co-Authored-By: Claude Opus 5 <[email protected]>
