I think that there's a mechanism to update the pluginrc, when a plugin was updated.
The number at the end of the first line of the diff looks like a timestamp: Can you delete the pluginrc and let Gimp rebuild it.
Then keep the generated line with the "plug-in-def" and replace the other lines according to the diff.
This works for me...
If it doesn't work for you, make a backup of the generated pluginrc and post the difference between the backup and your modified version, maybe there is another issue...
I think that there's a mechanism to update the pluginrc, when a plugin was updated.
The number at the end of the first line of the diff looks like a timestamp: Can you delete the pluginrc and let Gimp rebuild it.
Then keep the generated line with the "plug-in-def" and replace the other lines according to the diff.
This works for me...
If it doesn't work for you, make a backup of the generated pluginrc and post the difference between the backup and your modified version, maybe there is another issue...