scm: git: call entries_git() in adapter entry() for browsing tree performance (#7047).

cat/diff/blame link calls adapter entry().
Abstract adapter entry() calls adapter entries().
Git adapter entries() is very slow.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@5642 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/git_adapter.rb

@@ -115,7 +115,7 @@ module Redmine
             Entry.new(:path => '', :kind => 'dir')
           else
             # Search for the entry in the parent directory
-            es = entries(search_path, identifier)
+            es = entries_git(search_path, identifier)
             es ? es.detect {|e| e.name == search_name} : nil
           end
         end