[Gtkradiant] spog_branch creation point / branches with no symbolic name question

[Timothee Besset]

Spog:

I'm working with clkao to test his cvs -> svn conversion script.
GtkRadiant is a good stress test it seems, I'm not counting the number of
weird edge cases we've found so far :)

Anyway, see:
http://zerowing.idsoftware.com/viewcvs/viewcvs.cgi/GtkRadiant/radiant/map.cpp?graph=1
and specially the spog_branch creation. 

The branch for this file appears from another branch with no symbolic
name. Do you have any idea how those branches with no symbolic name are
crated? A branch tag being removed? Or some different operation?

TTimo