Fix fork page branch selection (#32711) (#32725)

Backport #32711 by @lunny

Fix #32709

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

templates/repo/pulls/fork.tmpl

@@ -53,20 +53,18 @@
 					</div>
 					<div class="inline field">
 						<label>{{ctx.Locale.Tr "repo.fork_branch"}}</label>
-						<div class="ui selection dropdown">
+						<div class="ui selection dropdown ellipsis-items-nowrap">
 							<input type="hidden" id="fork_single_branch" name="fork_single_branch" value="" required>
-							<span class="text truncated-item-container" data-value="" title="{{ctx.Locale.Tr "repo.all_branches"}}">
+							<div class="text" title="{{ctx.Locale.Tr "repo.all_branches"}}">
 								<span class="truncated-item-name">{{ctx.Locale.Tr "repo.all_branches"}}</span>
-							</span>
+							</div>
 							{{svg "octicon-triangle-down" 14 "dropdown icon"}}
 							<div class="menu">
-								<div class="item truncated-item-container" data-value="" title="{{ctx.Locale.Tr "repo.all_branches"}}">
-									<span class="truncated-item-name">{{ctx.Locale.Tr "repo.all_branches"}}</span>
+								<div class="item" data-value="" title="{{ctx.Locale.Tr "repo.all_branches"}}">
+									{{ctx.Locale.Tr "repo.all_branches"}}
 								</div>
 								{{range .Branches}}
-									<div class="item truncated-item-container" data-value="{{.}}" title="{{.}}">
-										<span class="truncated-item-name">{{.}}</span>
-									</div>
+									<div class="item" data-value="{{.}}" title="{{.}}">{{.}}</div>
 								{{end}}
 							</div>
 						</div>