gcommit should load default comments (from "bzr uncommit" and UI button "cancel but retain")

[Chad Miller]

Using bzr-gtk's "gcommit" verb, there may be several fields to fill if one has per-file commit messages on. These should be loaded from disc if there were comments previously stored.

There should be two ways that default comments may be stored:
 * "bzr uncommit",
 * in the gcommit UI, a button "Cancel and retain comments".

[Daniel Schierbeck (dasch)]

We need to decide on how to store the messages. The current option system probably won't suffice.

[Szilveszter Farkas (phanatic)]

This bug is related to bzr-gtk (not Bazaar), so I mark it as Invalid for Bazaar.

[Jelmer Vernooij (jelmer)]

Maybe we can store the revision metadata in serialized form on disk somewhere? somewhere in .bzr/checkout/ perhaps?

[Jelmer Vernooij (jelmer)]

this seems related to bzr as well, since bzr uncommit would need to store this info (and ideally we'd share the same store as qbzr)