Merge pull request #3966 from element-hq/feature/fga/create_room_config_improvements

changes: iterate on room create screen

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/CreateRoomDataStore.kt

@@ -102,7 +102,10 @@ class CreateRoomDataStore @Inject constructor(
         createRoomConfigFlow.getAndUpdate { config ->
             config.copy(
                 roomVisibility = when (config.roomVisibility) {
-                    is RoomVisibilityState.Public -> config.roomVisibility.copy(roomAddress = RoomAddress.Edited(address))
+                    is RoomVisibilityState.Public -> {
+                        val sanitizedAddress = address.lowercase()
+                        config.roomVisibility.copy(roomAddress = RoomAddress.Edited(sanitizedAddress))
+                    }
                     else -> config.roomVisibility
                 }
             )

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/configureroom/ConfigureRoomView.kt

@@ -240,9 +240,9 @@ private fun RoomTopic(
         modifier = modifier,
         label = stringResource(R.string.screen_create_room_topic_label),
         value = topic,
-        placeholder = stringResource(CommonStrings.common_topic_placeholder),
         onValueChange = onTopicChange,
         maxLines = 3,
+        supportingText = stringResource(CommonStrings.common_topic_placeholder),
         keyboardOptions = KeyboardOptions(
             capitalization = KeyboardCapitalization.Sentences,
         ),