According to the first comment (bug #42178#bug-branches-container) I see synaptic was changed to use /var/lib/synaptic/preferences instead of the global preferences file /etc/apt/preferences to make it less confusing.
However, I think synaptic is actually much more confusing because of that change! It confsued me, and I wasted time trying to deal with it and filing bug #1166568. I agree with what Daniel Hartwig wrote in comment #27. I too would like to see the 2004 change reverted, so that synaptic uses the global preferences file in future. It seems better and more logical to do it that way.
According to the first comment (bug #42178#bug-branches- container) I see synaptic was changed to use /var/lib/ synaptic/ preferences instead of the global preferences file /etc/apt/ preferences to make it less confusing.
However, I think synaptic is actually much more confusing because of that change! It confsued me, and I wasted time trying to deal with it and filing bug #1166568. I agree with what Daniel Hartwig wrote in comment #27. I too would like to see the 2004 change reverted, so that synaptic uses the global preferences file in future. It seems better and more logical to do it that way.