Fix issue with timeline message view reuse while rich text editor is enabled (#8688)

Author: jonnyandrew

changelog.d/8688.bugfix

@@ -0,0 +1 @@
+Fix issue with timeline message view reuse while rich text editor is enabled

vector/src/main/java/im/vector/app/features/home/room/detail/timeline/item/MessageTextItem.kt

@@ -85,8 +85,13 @@ abstract class MessageTextItem : AbsMessageItem<MessageTextItem.Holder>() {
         }
         holder.previewUrlView.delegate = previewUrlCallback
         holder.previewUrlView.renderMessageLayout(attributes.informationData.messageLayout)
-
-        val messageView: AppCompatTextView = if (useRichTextEditorStyle) holder.richMessageView else holder.plainMessageView
+        if (useRichTextEditorStyle) {
+            holder.plainMessageView?.isVisible = false
+        } else {
+            holder.richMessageView?.isVisible = false
+        }
+        val messageView: AppCompatTextView = if (useRichTextEditorStyle) holder.requireRichMessageView() else holder.requirePlainMessageView()
+        messageView.isVisible = true
         if (useBigFont) {
             messageView.textSize = 44F
         } else {
@@ -133,11 +138,21 @@ abstract class MessageTextItem : AbsMessageItem<MessageTextItem.Holder>() {
         val previewUrlView by bind<PreviewUrlView>(R.id.messageUrlPreview)
         private val richMessageStub by bind<ViewStub>(R.id.richMessageTextViewStub)
         private val plainMessageStub by bind<ViewStub>(R.id.plainMessageTextViewStub)
-        val richMessageView: AppCompatTextView by lazy {
-            richMessageStub.inflate().findViewById(R.id.messageTextView)
+        var richMessageView: AppCompatTextView? = null
+            private set
+        var plainMessageView: AppCompatTextView? = null
+            private set
+
+        fun requireRichMessageView(): AppCompatTextView {
+            val view = richMessageView ?: richMessageStub.inflate().findViewById(R.id.messageTextView)
+            richMessageView = view
+            return view
         }
-        val plainMessageView: AppCompatTextView by lazy {
-            plainMessageStub.inflate().findViewById(R.id.messageTextView)
+
+        fun requirePlainMessageView(): AppCompatTextView {
+            val view = plainMessageView ?: plainMessageStub.inflate().findViewById(R.id.messageTextView)
+            plainMessageView = view
+            return view
         }
     }