Imagine a project that is being translated and that has automatic updates set. The translator translates X number of strings. The following night, his strings are successfully exported to the specified bzr branch. But sometimes (and only sometimes), the next day another export will occur, but with no useful changed information, as the only modifications are the metadata lines "PO-Revision-Date" and "X-Launchpad-Export-Date".
Here are several examples:
http://bazaar.launchpad.net/~itt-devs/issuetrackertracker/main/revision/197
http://bazaar.launchpad.net/~itt-devs/issuetrackertracker/main/revision/196 (for cs and it, note that for cs "Last-Translator" also gets modified while I never modified a string in cs, maybe another bug or reason for this new export?)
http://bazaar.launchpad.net/~itt-devs/issuetrackertracker/main/revision/190 (fr)
http://bazaar.launchpad.net/~bashareteam/bashare/main/revision/124 (cs)
I suspect there might be something odd going on in the code that detects changed translations (related to bug #407590 ?). Or might it be that the dates get updated after the first export, and that on the next run it thus appears as if there occurred a new change after the last export?
Looking at rev 196 and 197 of issuetrackertracker (first 2 examples), you will see that:
rev 196 occurs at 2010-01-30 04:44:12
rev 197 sets "PO-Revision-Date: 2010-01-30 05:46+0000", which is indeed after the last export.
Why is this revision date later? Would it be related to an automatic import, that would have taken place 1 hour after the template being exported to the branch in rev 196?
After re-reading my bug description, I kind of have the feeling that it could be related to the automatic imports that happen after each commit...