require Post Notifications permission if the app is the default

app/src/main/AndroidManifest.xml

@@ -19,6 +19,7 @@
     <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
     <uses-permission android:name="android.telecom.action.CONFIGURE_PHONE_ACCOUNT" />
     <uses-permission android:name="android.permission.VIBRATE" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
 
     <uses-permission
         android:name="android.permission.WRITE_EXTERNAL_STORAGE"

app/src/main/kotlin/com/simplemobiletools/dialer/activities/MainActivity.kt

@@ -75,6 +75,12 @@ class MainActivity : SimpleActivity() {
                 snackbar.setActionTextColor(getProperTextColor())
                 snackbar.show()
             }
+
+            handleNotificationPermission { granted ->
+                if (!granted) {
+                    toast(R.string.no_post_notifications_permissions)
+                }
+            }
         } else {
             launchSetDefaultDialerIntent()
         }