gimp-gap Duplicate Frames broken

[Carl Karsten]

apt-get install gimp-gap
run gimp, close the tip of the day.
File New OK (create an image)

<image>, Video, "Duplicate Frames...", OK (current and realistic parameteres both cause the error, so don't bother touching)

error: "could not rename frame 164 to 165"

That demos the bug.

For a bit more info:

close all gimp windows.
root@dhcp24:~# pgrep gimp
(nothing - no gimp running)

repeat the steps from above:
run gimp, close tip, File, New, Ok, <image>, Video, "Duplicate Frames...", OK

error: "could not rename frame 165 to 166"

close gimp, run again, but this time set Frames to 5, OK
error: "could not rename frame 166 to 171"

so,
the counter is using the same memory accross restarts,
and it isn't being reset.