I've tried the first time the duplicate file search feature based on content
as I wanted to cleanup a lot of duplicate pictures.
It seems to work quite smoothly but I'd like to suggest following features
a ) instead of deleting the files to move them into one target folder (no subfolder just one plain folder instead of trash)
a1 ) in case of same filneames - make the filenames unique - e.g. by either adding a number or part of the original path/directory
b ) preview of similar/same pictures
show the two/three/... same pictures so that there is a visible proof that it's really the same
c ) file information
probably with the preview pictures - add file information - e.g. dimension of the picture, file creation information, ...
which confirms further that it's the same picture
d ) from other tools there is also the ability to search for similar pictures
which allows e.g. to find thumbnails of bigger pictures - it would be nice to have that as an option to select
just a few thoughts which I hope you'll find interesting to implement