[IMPROVEMENT] Don't group messages with different alias (#14257)

app/ui-message/client/message.html

@@ -1,5 +1,5 @@
 <template name="message">
-	<li id="{{templatePrefix}}{{msg._id}}" data-id="{{msg._id}}" data-context={{actionContext}} class="message {{ignoredClass}} {{sequentialClass}} {{system}} {{t}} {{own}} {{isTemp}} {{chatops}} {{collapsed}} {{customClass}}" data-username="{{msg.u.username}}" data-tmid="{{msg.tmid}}" data-groupable="{{isGroupable}}" data-date="{{date}}" data-timestamp="{{timestamp}}">
+	<li id="{{templatePrefix}}{{msg._id}}" data-id="{{msg._id}}" data-context={{actionContext}} class="message {{ignoredClass}} {{sequentialClass}} {{system}} {{t}} {{own}} {{isTemp}} {{chatops}} {{collapsed}} {{customClass}}" data-username="{{msg.u.username}}" data-tmid="{{msg.tmid}}" data-groupable="{{isGroupable}}" data-date="{{date}}" data-timestamp="{{timestamp}}" data-alias="{{msg.alias}}">
 		{{#if isThreadReply}}
 			{{> messageThread parentMessage=parentMessage threadMessage=threadMessage following=msg.following avatar=msg.u.username msg=msg body=body class=bodyClass}}
 		{{else}}

app/ui-message/client/message.js

@@ -556,6 +556,10 @@ const isSequential = (currentNode, previousNode, forceDate, period, showDateSepa
 		return false;
 	}
 
+	if (previousDataset.alias !== currentDataset.alias) {
+		return false;
+	}
+
 	if (parseInt(currentDataset.timestamp) - parseInt(previousDataset.timestamp) <= period) {
 		return true;
 	}