Subtickets hierarchy problem

[dantequera1]

I have installed Subtickets plugin in Trac 1.5.3, apparently, it works fine, but when looking at the children of a ticket, they are sorted in numerical order, and not by hierarchy of parent, child.

Example:

It should come out like this:
#3010
---#3013
---#3015
------#3020
---#3017
#3012
#3030

But this comes out:
#3010
#3012
---#3013
---#3015
---#3017
------#3020
#3030

In the DB everything looks fine, but when it comes to displaying it, it does not.

The plugin version is 0.5.5 with some changes to remove ItemplateFilter and make it functional in trac 1.5.3.