Add feature flag for room alias suggestions, disabled by default.

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/messagecomposer/MessageComposerPresenter.kt

@@ -150,8 +150,10 @@ class MessageComposerPresenter @Inject constructor(
         }
         val markdownTextEditorState = rememberMarkdownTextEditorState(initialText = null, initialFocus = false)
         var isMentionsEnabled by remember { mutableStateOf(false) }
+        var isRoomAliasSuggestionsEnabled by remember { mutableStateOf(false) }
         LaunchedEffect(Unit) {
             isMentionsEnabled = featureFlagService.isFeatureEnabled(FeatureFlags.Mentions)
+            isRoomAliasSuggestionsEnabled = featureFlagService.isFeatureEnabled(FeatureFlags.RoomAliasSuggestions)
         }
 
         val cameraPermissionState = cameraPermissionPresenter.present()
@@ -235,7 +237,7 @@ class MessageComposerPresenter @Inject constructor(
                     val result = MentionSuggestionsProcessor.process(
                         suggestion = suggestion,
                         roomMembersState = roomMembersState,
-                        roomAliasSuggestions = roomAliasSuggestions,
+                        roomAliasSuggestions = if (isRoomAliasSuggestionsEnabled) roomAliasSuggestions else emptyList(),
                         currentUserId = currentUserId,
                         canSendRoomMention = ::canSendRoomMention,
                     )

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -72,6 +72,13 @@ enum class FeatureFlags(
         defaultValue = { true },
         isFinished = false,
     ),
+    RoomAliasSuggestions(
+        key = "feature.roomAliasSuggestions",
+        title = "Room alias suggestions",
+        description = "Type `#` to get room alias suggestions and insert them",
+        defaultValue = { false },
+        isFinished = false,
+    ),
     MarkAsUnread(
         key = "feature.markAsUnread",
         title = "Mark as unread",