show explanation for expire messages

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/controllers/ConversationInfoController.kt

@@ -705,6 +705,7 @@ class ConversationInfoController(args: Bundle) :
             databaseStorageModule?.setMessageExpiration(conversation!!.messageExpiration)
             binding.conversationInfoExpireMessages.setStorageModule(databaseStorageModule)
             binding.conversationInfoExpireMessages.visibility = View.VISIBLE
+            binding.conversationInfoExpireMessagesExplanation.visibility = View.VISIBLE
         } else {
             binding.categoryConversationSettings.visibility = View.GONE
         }

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

@@ -192,6 +192,17 @@
                     apc:mp_title="@string/nc_expire_messages">
                 </com.yarolegovich.mp.MaterialChoicePreference>
 
+                <TextView
+                    android:id="@+id/conversation_info_expire_messages_explanation"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:visibility="gone"
+                    android:layout_marginStart="@dimen/standard_margin"
+                    android:layout_marginEnd="@dimen/standard_margin"
+                    android:textColor="@color/disabled_text"
+                    android:text="@string/nc_expire_messages_explanation">
+                </TextView>
+
             </com.yarolegovich.mp.MaterialPreferenceCategory>
 
             <com.yarolegovich.mp.MaterialPreferenceCategory

app/src/main/res/values/strings.xml

@@ -576,6 +576,7 @@
     <string name="nc_expire_message_one_day">1 day</string>
     <string name="nc_expire_message_eight_hours">8 hours</string>
     <string name="nc_expire_message_one_hour">1 hour</string>
+    <string name="nc_expire_messages_explanation">Expire chat messages after a certain time. Files shared into the chat will only be unshared from the conversation but are not deleted for the owner.</string>
 
 
 </resources>