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Nick Khyl
b706df603a
Since edcc2c94, tailscaled closes the watch when a subscriber falls
behind. That doesn't work well for GUIs where closing the watch has side
effects. On Windows, the last client disconnecting can reset the backend
state unless unattended or always-on mode is enabled. On Android and
Apple platforms, nothing restarts a watch that ended this way, so the
UI silently stops updating.
Add ipn.NotifySuspendWhenBehind. A watcher that sets it stays connected
when it falls behind, but gets a Notify with Suspended set and nothing
else until the client resumes the session via the new resume-ipn-bus
LocalAPI endpoint or LocalBackend.ResumeWatchNotifications. Resuming
replays the initial Notify and new notifications follow from there.
Updates tailscale/corp#51067
Updates tailscale/corp#50256
Updates tailscale/corp#50907
Signed-off-by: Nick Khyl <nickk@tailscale.com>