Updated the patch to use the actual condition
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I've found a better solution which use the existing link_to_issue method. Added some assertions too.
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The same issue reproduces also in the edit time entry page where the call to "time_entries/new.js" is not made. The JS block which makes the call is rendered only for new records and it is not enough to remove the if statement.

<pre><code class="erb">
<% if @time_entry.new_record? %>
$(document).ready(function(){
$('#time_entry_project_id, #time_entry_issue_id').change(function(){
$.ajax({
url: '<%= escape_javascript new_time_entry_path(:format => 'js') %>',
type: 'post',
data: $('#new_time_entry').serialize()
});
});
});
<% end %>
</code></pre>
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This should be fixed on both new and edit forms by r15951, thanks.
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Some routes were changed, setting target to next major release.
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