[FIX] Mentions message missing 'jump to message' action (#14430)

* fixed context

* threads context

app/mentions-flextab/client/views/mentionsFlexTab.html

@@ -9,7 +9,7 @@
 	<div class="flex-tab__result js-list">
 		<ul class="mentioned-messages-list list clearfix">
 			{{# with messageContext}}
-				{{#each msg in messages}}{{#nrr nrrargs 'message' msg=msg room=room subscription=subscription settings=settings u=u}}{{/nrr}}{{/each}}
+				{{#each msg in messages}}{{#nrr nrrargs 'message' msg=msg room=room subscription=subscription settings=settings u=u customClass="mentions" context="mentions"}}{{/nrr}}{{/each}}
 			{{/with}}
 		</ul>
 		{{#if hasMore}}

app/mentions-flextab/client/views/mentionsFlexTab.js

@@ -10,9 +10,6 @@ Template.mentionsFlexTab.helpers({
 	messages() {
 		return Template.instance().cursor;
 	},
-	message() {
-		return _.extend(this, { customClass: 'mentions', actionContext: 'mentions' });
-	},
 	hasMore() {
 		return Template.instance().hasMore.get();
 	},

app/threads/client/flextab/thread.html

@@ -23,7 +23,7 @@
 				{{else}}
 						{{> message groupable=false hideRoles=true msg=mainMessage room=room subscription=subscription settings=settings customClass="thread-message" templatePrefix='thread-' customClass="thread-main" u=u}}
 						{{#each msg in messages}}
-							{{> message hideRoles=true msg=msg room=room subscription=subscription settings=settings templatePrefix='thread-' u=u}}
+							{{> message hideRoles=true msg=msg room=room subscription=subscription settings=settings templatePrefix='thread-' u=u context="threads"}}
 						{{/each}}
 					{{/if}}
 				{{/with}}

app/ui-message/client/message.js

@@ -374,9 +374,13 @@ Template.message.helpers({
 		}
 		return roomTypes.getIcon(room);
 	},
+	customClass() {
+		const { customClass, msg } = this;
+		return customClass || msg.customClass;
+	},
 	fromSearch() {
-		const { customClass } = this;
-		return customClass === 'search';
+		const { customClass, msg } = this;
+		return [msg.customClass, customClass].includes('search');
 	},
 	actionContext() {
 		const { msg } = this;