coroutines: lifecycleScope is by default on Main.immediate

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/activity/BaseActivity.kt

@@ -10,7 +10,6 @@ import androidx.databinding.CallbackRegistry.NotifierCallback
 import androidx.lifecycle.lifecycleScope
 import com.wireguard.android.Application
 import com.wireguard.android.model.ObservableTunnel
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 
 /**
@@ -39,7 +38,7 @@ abstract class BaseActivity : ThemeChangeAwareActivity() {
             else -> null
         }
         if (savedTunnelName != null)
-            lifecycleScope.launch(Dispatchers.Main.immediate) { selectedTunnel = Application.getTunnelManager().getTunnels()[savedTunnelName] }
+            lifecycleScope.launch { selectedTunnel = Application.getTunnelManager().getTunnels()[savedTunnelName] }
 
         // The selected tunnel must be set before the superclass method recreates fragments.
         super.onCreate(savedInstanceState)

ui/src/main/java/com/wireguard/android/activity/SettingsActivity.kt

@@ -102,7 +102,7 @@ class SettingsActivity : ThemeChangeAwareActivity() {
                     preferenceManager.findPreference<Preference>("multiple_tunnels")
             ).filterNotNull()
             wgQuickOnlyPrefs.forEach { it.isVisible = false }
-            lifecycleScope.launch(Dispatchers.Main.immediate) {
+            lifecycleScope.launch {
                 if (Application.getBackend() is WgQuickBackend) {
                     ++preferenceScreen.initialExpandedChildrenCount
                     wgQuickOnlyPrefs.forEach { it.isVisible = true }
@@ -121,7 +121,7 @@ class SettingsActivity : ThemeChangeAwareActivity() {
                 moduleInstaller?.parent?.removePreference(moduleInstaller)
             } else {
                 kernelModuleDisabler?.parent?.removePreference(kernelModuleDisabler)
-                lifecycleScope.launch(Dispatchers.Main.immediate) {
+                lifecycleScope.launch {
                     try {
                         withContext(Dispatchers.IO) { Application.getRootShell().start() }
                         moduleInstaller?.isVisible = true

ui/src/main/java/com/wireguard/android/activity/TunnelToggleActivity.kt

@@ -18,7 +18,6 @@ import com.wireguard.android.QuickTileService
 import com.wireguard.android.R
 import com.wireguard.android.backend.Tunnel
 import com.wireguard.android.util.ErrorMessages
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 
 @RequiresApi(Build.VERSION_CODES.N)
@@ -26,7 +25,7 @@ class TunnelToggleActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         val tunnel = Application.getTunnelManager().lastUsedTunnel ?: return
-        lifecycleScope.launch(Dispatchers.Main.immediate) {
+        lifecycleScope.launch {
             try {
                 tunnel.setStateAsync(Tunnel.State.TOGGLE)
             } catch (e: Throwable) {