what if tracker url changes?

[Voelker, Bernhard]

Hi,
 
given I have a
  trac_myproject_url = http://some.where/trac

and then do a few commit
  bzr ci -m. --fixes=myproject:1234

After some time, TRAC must be relocated to another server:   
  trac_myproject_url = https://any.where/trac

Then `bzr log` still shows the old URL for the fixes.
I'd have expected not the full URL to be saved as part of the checkin,
but instead just the "myproject:1234" which is then resolved at the
time `bzr log` is run.

Any idea?

Have a nice day,
Berny