Object generation numbers aren't updated (except in the xref table)
Submitted by Jakub Alba
Assigned to poppler-bugs
If you update an object, its generation number will only be incremented in the cross-reference table, but e.g. not in the object header or, if it is the "Info" dictionary, in the "Info" entry of the trailer dictionary.
To reproduce this bug, update an object (e.g. modify a single annotation in evince) and use "tail" unix utility with the "-n" option big enough (e.g. 100) to see the object header of the updated object. No matter how many times you update the object, the generation number is still the same. The generation number in the cross-reference table will be updated though.