Workspace i is KWin's desktop i, and switching and moving by index came with the
workspaces. What a user binds keys to besides is the rest of komorebi's
workspace commands: going to the next or the previous workspace (or the next
empty one), back to the last one, adding and closing workspaces, showing one
index on every monitor, and setting the layout or the tiling of a workspace that
need not be in front. They are made of the same two operations, showing a
workspace and moving a container to one, so KWin keeps doing the showing and the
hiding.
A workspace gets a name, which focus-named-workspace, named-workspace-layout and
named-workspace-tiling find it by on any monitor; focusing a named workspace
focuses its monitor too, so focus_monitor comes with it. The name is komorebi's:
naming a workspace does not rename KWin's desktop. The query
focused-workspace-name answers with the name, or the index of a workspace that
has none.
The moves to a named workspace, and everything that addresses a monitor, are
moves between monitors in the window manager and come with more than one
monitor.
komorebi's workspaces exist on Windows and macOS because neither has a virtual
desktop API: switching hides every window of the workspace being left. KWin has
virtual desktops, per output since 6.8, so here workspace i is KWin's desktop i
on every monitor, and each monitor shows one. KWin shows, hides and focuses the
windows of a desktop; komorebi asks for a switch, puts a window on a desktop,
and follows what anything else does.
The Backend gets the workspace methods (ensure_workspaces, switch_workspace,
set_window_workspace, window_workspace, current_workspaces), and the fake its
desktops. The bridge reports the desktops, the desktop each output shows and a
window's desktops, and carries out output_desktop and desktop commands, typed
and tested with the fixtures like the rest. The table turns a switch or a move
komorebi did not make into a WorkspaceChange or a WorkspaceMove, and records its
own when it sends them, so that KWin's report of those raises nothing. The
window manager follows a switch with no command in reply
(adopt_workspace_change), puts windows on their desktops before a desktop is
shown (focusing a window first would take the monitor back), and loads the
windows open at startup onto the workspace of their desktop.
Per-output desktops are a kwinrc setting that is off by default, and
kwriteconfig6 was not on the PATH of the user service in a live session, so
komorebi edits kwinrc itself (kwin::kwinrc) and puts the user's value back when
it stops, also after a crash.
focus-workspace, move-to-workspace and send-to-workspace come with this commit,
since the tests of switching and moving, and vm-workspace-switch, need them; the
named and cycling workspace commands follow. vm-workspace-switch runs the daemon
against a real KWin; vm-kwin-contract checks what komorebi relies on from KWin's
per-output desktops, on a headless KWin with two outputs and no komorebi.
LGUG2Z