fix(chat): avoid ClassCastException when building FileParameters

  ChatMessageUi.messageParameters is built via Kotlin's toMap(), which
  returns a Collections.SingletonMap for a single entry instead of a
  HashMap. Both call sites unsafely cast it to
  HashMap<String?, HashMap<String?, String?>>?, which crashes whenever a
  message has exactly one rich-object parameter (e.g. a plain file
  share) - the common case for FileParameters.

  Build real HashMap instances from messageParameters instead of casting
  it. Also removes a runCatching block in
  LazyListState.visibleItemsWithThreshold() that silently swallowed the
  same ClassCastException, which was hiding this bug and causing file id
  lookups to fail there.

fixed crash:

❯ 2026-08-07 12:02:40.777 28629-28629 NextcloudT...pplication com.nextcloud.talk2                  E  Uncaught exception in thread "main" (Fix with AI)
                                                                                                      java.lang.ClassCastException: java.util.Collections$SingletonMap cannot be cast to
  java.util.HashMap
                                                                                                          at com.nextcloud.talk.ui.chat.MediaMessageKt.MediaMessage(MediaMessage.kt:71)
                                                                                                          at
  com.nextcloud.talk.ui.chat.ChatMessageViewKt.ChatMessageView$lambda$5$1(ChatMessageView.kt:151)
                                                                                                          at
  com.nextcloud.talk.ui.chat.ChatMessageViewKt.$r8$lambda$BiaHdWRFag7qJIfvY45CugWWbIY(ChatMessageView.kt:0)
                                                                                                          at
  com.nextcloud.talk.ui.chat.ChatMessageViewKt$$ExternalSyntheticLambda1.invoke(D8$$SyntheticClass:0)
                                                                                                          at
  androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:122)
                                                                                                          at
  androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:52)
                                                                                                          at
  com.nextcloud.talk.ui.chat.SwipeToReplyContainerKt.SwipeToReplyContainer(SwipeToReplyContainer.kt:57)
                                                                                                          at
  com.nextcloud.talk.ui.chat.ChatMessageViewKt.ChatMessageView$lambda$5(ChatMessageView.kt:114)
                                                                                                          at
  com.nextcloud.talk.ui.chat.ChatMessageViewKt$$ExternalSyntheticLambda4.invoke(D8$$SyntheticClass:0)
                                                                                                          at
  androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:122)
                                                                                                          at
  androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:52)
                                                                                                          at
  androidx.compose.runtime.CompositionLocalKt.CompositionLocalProvider(CompositionLocal.kt:408)
                                                                                                          at
  com.nextcloud.talk.ui.chat.ChatMessageViewKt.ChatMessageView(ChatMessageView.kt:105)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

Author: mahibi

app/src/main/java/com/nextcloud/talk/chat/ChatActivity.kt

@@ -1001,16 +1001,11 @@ class ChatActivity :
             var result: String? = null
             message?.let {
                 if (message.messageParameters.isNotEmpty()) {
-                    runCatching {
-                        message.messageParameters as HashMap<String?, HashMap<String?, String?>>?
-                        val fileParameters = FileParameters(message.messageParameters)
-                        result = fileParameters.id
-                    }.onFailure { e ->
-                        when (e) {
-                            is ClassCastException -> {} // weird
-                            else -> Log.e(TAG, "Error in LazyListState.visibleItemsWithThreshold $e")
-                        }
-                    }
+                    val normalizedParameters = HashMap<String?, HashMap<String?, String?>>(
+                        message.messageParameters.mapValues { (_, params) -> HashMap(params) }
+                    )
+                    val fileParameters = FileParameters(normalizedParameters)
+                    result = fileParameters.id
                 }
             }
 

app/src/main/java/com/nextcloud/talk/ui/chat/MediaMessage.kt

@@ -68,7 +68,13 @@ fun MediaMessage(
     onImageClick: (Int) -> Unit
 ) {
     val fileParameters =
-        remember { FileParameters(message.messageParameters as HashMap<String?, HashMap<String?, String?>>?) }
+        remember {
+            FileParameters(
+                HashMap(
+                    message.messageParameters.mapValues { (_, params) -> HashMap(params) }
+                )
+            )
+        }
 
     val hasExplicitCaption = message.plainMessage != FILE_PLACEHOLDER_MESSAGE
     val hasPreview = !typeContent.previewUrl.isNullOrEmpty()