Rename: hit enter to accept new name
In the rename dialog, you can no longer type a new name and then hit enter as you could in older versions of gThumb. As far as I can tell, you must move the mouse to the rename button or tab up to it. This makes renaming a large number of images take much longer. It is expected that hitting enter renames the file with the new name (as with any file rename dialog that I've come across, in GNOME or otherwise).
I'm using gThumb 3.6.1 on Ubuntu 18.04. Version 3.4.3 definitely worked correctly, but I'm not sure when the bug was introduced.
Thanks!