This fixes a bug which happens if screen time limits are *disabled* and
the history file
(`~/.local/share/gnome-shell/session-active-history.json`) is missing
when gnome-shell is started.
If so, the code would previously have incorrectly called
`this._stopStateMachine()` on startup, even though the state machine
wasn’t running. This adds a fake transition from ACTIVE to INACTIVE to
the history file.
If the user later (that day) enables time limits, the code assumes that
they were active from the start of the day through to that fake
transition, which is possibly sufficient time to reach the user’s limit
already. This results in the screen immediately being made greyscale as
the limit has apparently been reached.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/8155
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3597>
08b06acc4c