com/templates/repo/issue/branch_selector_field.tmpl

{{if and (not .Issue.IsPull) (not .PageIsComparePull)}}
<input id="ref_selector" name="ref" type="hidden" value="{{.Issue.Ref}}">
<div class="ui {{if .ReadOnly}}disabled{{end}} floating filter select-branch dropdown" data-no-results="{{.i18n.Tr "repo.pulls.no_results"}}">
	<div class="ui basic small button">
		<span class="text branch-name">{{if .Issue.Ref}}{{.Issue.Ref}}{{else}}{{.i18n.Tr "repo.issues.no_ref"}}{{end}}</span>
		<i class="dropdown icon"></i>
	</div>
	<div class="menu">
		<div class="ui icon search input">
			<i class="filter icon"></i>
			<input name="search" placeholder="{{.i18n.Tr "repo.filter_branch_and_tag"}}...">
		</div>
		<div class="header">
			<div class="ui grid">
				<div class="two column row">
					<a class="reference column" href="#" data-target="#branch-list">
						<span class="text black">
							<i class="octicon octicon-git-branch"></i> {{.i18n.Tr "repo.branches"}}
						</span>
					</a>
					<a class="reference column" href="#" data-target="#tag-list">
						<span class="text">
							<i class="reference tags icon"></i> {{.i18n.Tr "repo.tags"}}
						</span>
					</a>
				</div>
			</div>
		</div>
		<div id="branch-list" class="scrolling menu reference-list-menu">
		{{range .Branches}}
			<div class="item" data-id="{{.}}" data-id-selector="#ref_selector">{{.}}</div>
		{{end}}
		</div>
		<div id="tag-list" class="scrolling menu reference-list-menu" style="display: none">
		{{range .Tags}}
			<div class="item" data-id="{{.}}" data-id-selector="#ref_selector">{{.}}</div>
		{{end}}
		</div>
	</div>
</div>

<div class="ui divider"></div>
{{end}}