limit channel names to 11 characters

app/src/main/java/com/geeksville/mesh/ui/ChannelFragment.kt

@@ -316,7 +316,7 @@ class ChannelFragment : ScreenFragment("Channel"), Logging {
                                 val random = SecureRandom()
                                 val bytes = ByteArray(32)
                                 random.nextBytes(bytes)
-                                newSettings.name = newName
+                                newSettings.name = newName.take(11)
                                 newSettings.psk = ByteString.copyFrom(bytes)
                             } else {
                                 debug("Switching back to default channel")

app/src/main/res/layout/channel_fragment.xml

@@ -13,6 +13,8 @@
         android:layout_marginTop="16dp"
         android:layout_marginEnd="64dp"
         android:hint="@string/channel_name"
+        app:counterEnabled="true"
+        app:counterMaxLength="11"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent">
@@ -23,7 +25,6 @@
             android:layout_height="wrap_content"
             android:digits="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890- "
             android:imeOptions="actionDone"
-            android:maxLength="15"
             android:singleLine="true"
             android:text="@string/unset" />
     </com.google.android.material.textfield.TextInputLayout>