fix attachment overflow (FF)

I started to discuss this problem here https://github.com/philipwalton/flexbugs/issues/39#issuecomment-111211260 and in a Firefox bug https://bugzilla.mozilla.org/show_bug.cgi?id=1136818 but people defend this behaviour intended..

app/assets/javascripts/app/views/layout_ref/communication_overview.jst.eco

@@ -231,19 +231,19 @@ Oliver<br>
               <div class="attachments">
                 <svg class="icon-paperclip"><use xlink:href="#icon-paperclip" /></svg>
                 <h3>2 <%- @T('Attached Files') %></h3>
-                <div class="attachment horizontal">
+                <div class="attachment">
                   <div class="attachment-name u-highlight">midinotes_view.jpg</div>
                   <div class="attachment-size">35.5 kb</div>
                 </div>
-                <div class="attachment horizontal">
+                <div class="attachment">
                   <div class="attachment-name u-highlight">lyrics_I_Like_it_Loud.txt</div>
                   <div class="attachment-size">17.1 kb</div>
                 </div>
-                <div class="attachment horizontal">
+                <div class="attachment">
                   <div class="attachment-name u-highlight">something with very long line which is slonger as the container arount it if you can see it I wish you a very happy day.txt</div>
                   <div class="attachment-size">17.1 kb</div>
                 </div>
-                <div class="attachment horizontal">
+                <div class="attachment">
                   <div class="attachment-name u-highlight">something-withverylonglinewhichisslongerasthecontainerarountitifyoucanseeitIwishyouaveryhappyday.txt</div>
                   <div class="attachment-size">17.1 kb</div>
                 </div>

app/assets/javascripts/app/views/layout_ref/communication_reply.jst.eco

@@ -16,14 +16,14 @@
           <div class="attachments"></div>
           
           <!-- <div>
-            <div class="attachment horizontal">
+            <div class="attachment">
               <div class="attachment-name u-highlight">sega-genesis-box.gif</div>
               <div class="attachment-size">2.4mb</div>
               <div class="attachment-delete js-delete align-right u-clickable">
                 <svg class="icon icon-diagonal-cross"><use xlink:href="#icon-diagonal-cross" /></svg><%- @T('Delete File') %>
               </div>
             </div>
-            <div class="attachment horizontal">
+            <div class="attachment">
               <div class="attachment-name u-highlight">license-key.txt</div>
               <div class="attachment-size">7kb</div>
               <div class="attachment-delete js-delete align-right u-clickable">

app/assets/javascripts/app/views/layout_ref/highlight.jst.eco

@@ -63,7 +63,7 @@
           </a>
       </ul>
     </div>
-    <div class="page-header horizontal">
+    <div class="page-header">
       <div class="flex vertical center">
         <span class="avatar unique user-popover size-50" data-id="2" style="background-position: -92.79607555375712px -106.24902447601627px;" data-original-title="" title="">NB</span>
         <div class="ticket-title">
@@ -274,15 +274,15 @@ Oliver<br></div>
               <div class="attachments">
                 <svg class="icon-paperclip"><use xlink:href="#icon-paperclip" /></svg>
                 <h3>2 <%- @T('Attached Files') %></h3>
-                <div class="attachment horizontal">
+                <div class="attachment">
                   <div class="attachment-name u-highlight">midinotes_view.jpg</div>
                   <div class="attachment-size">35.5 kb</div>
                 </div>
-                <div class="attachment horizontal">
+                <div class="attachment">
                   <div class="attachment-name u-highlight">lyrics_I_Like_it_Loud.txt</div>
                   <div class="attachment-size">17.1 kb</div>
                 </div>
-                <div class="attachment horizontal">
+                <div class="attachment">
                   <div class="attachment-name u-highlight">something with very long line which is slonger as the container arount it if you can see it I wish you a very happy day.txt</div>
                   <div class="attachment-size">17.1 kb</div>
                 </div>

app/assets/javascripts/app/views/ticket_zoom/article_view.jst.eco

@@ -54,7 +54,7 @@
               <svg class="icon-paperclip"><use xlink:href="#icon-paperclip" /></svg>
               <h3><%- @article.attachments.length %> <%- @T('Attached Files') %></h3>
               <% for attachment in @article.attachments: %>
-                <div class="attachment horizontal">
+                <div class="attachment">
                   <a class="attachment-name u-highlight" href="<%= App.Config.get('api_path') %>/ticket_attachment/<%= @article.ticket_id %>/<%= @article.id %>/<%= attachment.id %>" target="_blank" data-type="attachment"><%= attachment.filename %></a>
                   <div class="attachment-size"><%- @humanFileSize(attachment.size) %></div>
                 </div>

app/assets/stylesheets/zammad.css.scss

@@ -3522,6 +3522,7 @@ footer {
 
       .attachment-name {
         margin-right: 5px;
+        min-width: 0;
         @extend .u-highlight;
       }