Move a number of global state vars into the Menu struct, keeping things
better encapsulated. The systray package still relies on its own global
state, so only a single Menu instance can run at a time.
Move a lot of the initialization logic out of onReady, in particular
fetching the latest tailscale state. Instead, populate the state before
calling systray.Run, which fixes a timing issue in GNOME (#14477).
This change also creates a separate bgContext for actions not tied menu
item clicks. Because we have to rebuild the entire menu regularly, we
cancel that context as needed, which can cancel subsequent updateState
calls.
Also exit cleanly on SIGINT and SIGTERM.
Updates #1708Fixes#14477
Change-Id: Ia101a4a3005adb9118051b3416f5a64a4a45987d
Signed-off-by: Will Norris <will@tailscale.com>
Will Norris
5a4148e7e8