Rocket.Chat/app/threads/client/flextab/thread.html

<template name="thread">
	<header class="contextual-bar__header">
		<div class="contextual-bar__header-data">
			{{> icon block="contextual-bar__header-icon" icon='thread'}}
			<h2 class="contextual-bar__header-title">
				<span class="message-body--unstyled">{{{threadTitle}}}</span>
				{{!-- <sub class="contextual-bar__header-description">{{room.fname}}</sub> --}}
			</h2>
		</div>
		<button class="contextual-bar__header-close js-close">
			{{> icon block="contextual-bar__header-close-icon" icon="plus"}}
		</button>
	</header>
	<section class="contextual-bar__content flex-tab threads dropzone">
		<div class="dropzone-overlay background-transparent-darkest color-content-background-color">{{_ "Drop_to_upload_file"}}</div>
		<div class="thread-list js-scroll-thread">
			<ul class="thread">
				{{# with messageContext}}
				{{#if isLoading}}
				<li class="load-more">
					{{> loading}}
				</li>
				{{else}}
						{{> message groupable=false hideRoles=true msg=mainMessage room=room subscription=subscription settings=settings customClass="thread-message" templatePrefix='thread-' customClass="thread-main" u=u ignored=false}}
						{{#each msg in messages}}
							{{> message hideRoles=true msg=msg room=room subscription=subscription settings=settings templatePrefix='thread-' u=u context="threads"}}
						{{/each}}
					{{/if}}
				{{/with}}
			</ul>
		</div>
		{{> messageBox messageBoxData}}
	</section>
</template>