Prevent the left-hand navbar from becoming wider and wider for very wide viewports.

- Legacy-Id: 9386

ietf/templates/ietf.html

@@ -69,7 +69,7 @@
 
         {% if not hide_menu %} {# ugly hack for the more or less unported meeting agenda edit pages #}
           <div class="row">
-	    <div class="col-xs-3 col-md-2 leftmenu">
+	    <div class="col-xs-3 col-md-2 leftmenu col-fixed-leftmenu">
 	      <ul class="nav nav-pills nav-stacked panel panel-default panel-body">
                 {% include "base/menu.html" with flavor="left" %}
               </ul>

static/css/ietf.css

@@ -301,3 +301,7 @@ form.add-email textarea {
 table.materials .snippable {
   width: 25em;
 }
+
+.col-fixed-leftmenu {
+  max-width: 200px;
+}