Fix some UI problems (dropdown/container) (#30849)

Follow #30345
Follow #30547

`ellipsis` / `white-space` shouldn't be put on the general dropdown components.

templates/repo/issue/view_content/reference_issue_dialog.tmpl

@@ -7,7 +7,7 @@
 			{{.CsrfTokenHtml}}
 			<div class="field">
 				<label><strong>{{ctx.Locale.Tr "repository"}}</strong></label>
-				<div class="ui search selection dropdown issue_reference_repository_search">
+				<div class="ui search selection dropdown issue_reference_repository_search ellipsis-items-nowrap">
 					<div class="default text gt-ellipsis">{{.Repository.FullName}}</div>
 					<div class="menu"></div>
 				</div>