scm: in repository tree, use find_changeset_by_name instead of changesets.find_by_revision (#3724, #3421).

Mercurial revision numbers are far too brittle.
Please see #6681 description.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4858 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/repositories/_dir_list_content.rhtml

@@ -16,7 +16,7 @@
           :class => (entry.is_dir? ? 'icon icon-folder' : "icon icon-file #{Redmine::MimeType.css_class_of(entry.name)}")%>
 </td>
 <td class="size"><%= (entry.size ? number_to_human_size(entry.size) : "?") unless entry.is_dir? %></td>
-<% changeset = @project.repository.changesets.find_by_revision(entry.lastrev.identifier) if entry.lastrev && entry.lastrev.identifier %>
+<% changeset = @project.repository.find_changeset_by_name(entry.lastrev.identifier) if entry.lastrev && entry.lastrev.identifier %>
 <td class="revision"><%= link_to_revision(changeset, @project) if changeset %></td>
 <td class="age"><%= distance_of_time_in_words(entry.lastrev.time, Time.now) if entry.lastrev && entry.lastrev.time %></td>
 <td class="author"><%= changeset.nil? ? h(entry.lastrev.author.to_s.split('<').first) : changeset.author if entry.lastrev %></td>