scmutil: fix requires-file isalnum() check on first byte
Slice instead of subscript to get a bytes from a bytes.
# skip-blame just a py3 slice-instead-of-subscript change
Differential Revision: https://phab.mercurial-scm.org/D2341
{header}
<title>{repo|escape}: shortlog</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 class="buttons">
<a href="{url|urlescape}log/{symrev}{sessionvars%urlparameter}">changelog</a>
<a href="{url|urlescape}graph/{symrev}{sessionvars%urlparameter}">graph</a>
<a href="{url|urlescape}tags{sessionvars%urlparameter}">tags</a>
<a href="{url|urlescape}branches{sessionvars%urlparameter}">branches</a>
<a href="{url|urlescape}file/{symrev}/{sessionvars%urlparameter}">files</a>
{archives%archiveentry}
<a href="{url|urlescape}help{sessionvars%urlparameter}">help</a>
<a type="application/rss+xml" href="{url|urlescape}rss-log">rss</a>
<a type="application/rss+xml" href="{url|urlescape}atom-log" title="Atom feed for {repo|escape}">atom</a>
</div>
<h2><a href="/">Mercurial</a> {pathdef%breadcrumb} / shortlog</h2>
<form action="{url|urlescape}log">
{sessionvars%hiddenformentry}
<p>
<label for="search1">search:</label>
<input name="rev" id="search1" type="text" size="30">
navigate: <small class="navigate">{changenav%navshort}</small>
</p>
</form>
{entries%shortlogentry}
<form action="{url|urlescape}log">
{sessionvars%hiddenformentry}
<p>
<label for="search2">search:</label>
<input name="rev" id="search2" type="text" size="30">
navigate: <small class="navigate">{changenav%navshort}</small>
</p>
</form>
{footer}