dirstate: don't overnormalize for ui.slash
This should fix the issue exposed by debugpathcomplete on the buildbot.
{header}
<title>{repo|escape}: Mercurial repository not found</title>
<link rel="alternate" type="application/atom+xml" href="{url|urlescape}atom-log" title="Atom feed for {repo|escape}"/>
<link rel="alternate" type="application/rss+xml" href="{url|urlescape}rss-log" title="RSS feed for {repo|escape}"/>
</head>
<body>
<div id="container">
<div class="page-header">
<h1 class="breadcrumb"><a href="/">Mercurial</a> {pathdef%breadcrumb} / not found: {repo|escape}</h1>
<form action="{url|urlescape}log">
{sessionvars%hiddenformentry}
<dl class="search">
<dt><label>Search: </label></dt>
<dd><input type="text" name="rev" /></dd>
</dl>
</form>
<ul class="page-nav">
<li class="current">summary</li>
<li><a href="{url|urlescape}shortlog{sessionvars%urlparameter}">shortlog</a></li>
<li><a href="{url|urlescape}log{sessionvars%urlparameter}">changelog</a></li>
<li><a href="{url|urlescape}graph/{node|short}{sessionvars%urlparameter}">graph</a></li>
<li><a href="{url|urlescape}tags{sessionvars%urlparameter}">tags</a></li>
<li><a href="{url|urlescape}bookmarks{sessionvars%urlparameter}">bookmarks</a></li>
<li><a href="{url|urlescape}branches{sessionvars%urlparameter}">branches</a></li>
<li><a href="{url|urlescape}file/{node|short}{sessionvars%urlparameter}">files</a>{archives%archiveentry}</li>
<li><a href="{url|urlescape}help{sessionvars%urlparameter}">help</a></li>
</ul>
</div>
<h2 class="no-link no-border">Not Found</h2>
<p class="normal">The specified repository "{repo|escape}" is unknown, sorry.</p>
<p class="normal">Please go back to the <a href="{url|urlescape}">main repository list page</a>.</p>
{footer}