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LGUG2Z
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While the screen is locked or the machine is asleep, KWin sends its clients no frame callbacks, so nothing komorebi asked for in that time is done: a window that something else moved stays where it was moved, and the monitors can come back in another order or at another size. Nothing told komorebi it had happened, and it kept the layout it had until the next event. kwin::power now watches for the two ends of it: logind's PrepareForSleep on the system bus, which only logind may send, and the lock screen's ActiveChanged on the session bus. When the machine wakes (2.5 seconds after it, while the outputs are found one after another) or the screen is unlocked (0.6 seconds after it, once the lock screen has gone), the monitor reconciliator gets a Wake and calls wake_up: it reconciles the monitors as for an unplug, reads their sizes, follows the windows to the monitors they are on and tiles every monitor, unless the window manager is paused. Going to sleep and locking do nothing, and a machine with no system bus or a session with no lock screen runs without them. The lock screen is a window of KWin's that the bridge already does not report as an application window, so it has no tile. The bridge also compares KWin's active window with the one it last announced once a second, because the window that is active again after an unlock is not always announced. vm-lock-sleep locks and unlocks a real Plasma session and checks that the windows come back to their tiles; a real suspend cannot be tested in the QEMU guest, only the signal wiring, which tests/power.rs covers on private buses. vm-lock-sleep waits for the panel's room before it opens the windows, so that they are tiled once, and compares the window that was moved with the tile the daemon has for it when it looks, give or take a cell of the terminal's font, and not with the frames read earlier: the room can come while the screen is locked, and the tiles read before are then not the ones. The wait is not a check, because a session on a machine as slow as TCG may never take the room.