android: drop health warnings in Stopped and NeedsLogin state

fixes tailscale/corp#36233

We should be dropping health warnings in the NeedsLogin state.
This matches the behaviour of iOS and macOS.

Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>

android/src/main/java/com/tailscale/ipn/ui/notifier/HealthNotifier.kt

@@ -45,26 +45,30 @@ class HealthNotifier(
           "wantrunning-false")
 
   init {
+    // This roughly matches the iOS/macOS implementation in terms of debouncing, and ingoring
+    // health warnings in various states.
     scope.launch {
       healthStateFlow
           .distinctUntilChanged { old, new -> old?.Warnings?.count() == new?.Warnings?.count() }
           .combine(ipnStateFlow, ::Pair)
-          .debounce(5000)
+          .debounce(3000)
           .collect { pair ->
             val health = pair.first
-            val ipnState = pair.second
-            // When the client is Stopped, no warnings should get added, and any warnings added
-            // previously should be removed.
-            if (ipnState == Ipn.State.Stopped) {
-              TSLog.d(
-                  TAG,
-                  "Ignoring and dropping all pre-existing health messages in the Stopped state")
-              dropAllWarnings()
-              return@collect
-            } else {
-              TSLog.d(TAG, "Health updated: ${health?.Warnings?.keys?.sorted()}")
-              health?.Warnings?.let {
-                notifyHealthUpdated(it.values.mapNotNull { it }.toTypedArray())
+            // When the client is Stopped, requires Login or has no state, we should drop all
+            // existing warnings
+            when (val ipnState = pair.second) {
+              Ipn.State.NeedsLogin,
+              Ipn.State.Stopped,
+              Ipn.State.NoState -> {
+                TSLog.d(TAG, "Ignoring and dropping all health messages in state ${ipnState}")
+                dropAllWarnings()
+                return@collect
+              }
+              else -> {
+                TSLog.d(TAG, "Health updated: ${health?.Warnings?.keys?.sorted()}")
+                health?.Warnings?.let {
+                  notifyHealthUpdated(it.values.mapNotNull { it }.toTypedArray())
+                }
               }
             }
           }