Updated Batcher to work with GIMP 3.0.0-RC1. Batcher now requires GIMP 3.0.0-RC1 or later. Earlier development versions of GIMP (2.99.x) will not work. Any future GIMP 3.x version will work unless stated otherwise.
Greatly optimized the preview when changing selection. The performance drop was noticeable for hundreds of items.
Fixed several bugs related to the preview when the selected item is changed.
Fixed Insert background and Insert foreground procedures inserting group layers twice.
Fixed occasional GIMP error messages when batch processing is finished.