chatview: add message separation util method

Tells if message separation is meeded.

Change-Id: If17e767b3469d77f3e5edc8a2a84a5df6bcb50a3

jami-android/app/src/main/java/cx/ring/adapters/ConversationAdapter.kt

@@ -1474,6 +1474,20 @@ class ConversationAdapter(
         }
     }
 
+    /**
+     * Message Separation is used to highlight two group of messages.
+     * We don't need message separation if:
+     * - The message is the first of the conversation
+     * - The message is the first of the day (date already shown)
+     */
+    private fun isMessageSeparationNeeded(
+        isDateShown: Boolean,
+        messagePosition: Int,
+    ): Boolean = getPreviousInteractionFromPosition(messagePosition)?.let { firstInteraction ->
+        val secondInteraction = mInteractions[messagePosition]
+        !isDateShown && isSeqBreak(firstInteraction, secondInteraction)
+    } ?: false
+
     /**
      * Configures the viewHolder to display a call info text message, ie. not a classic text message
      *