Yes, it still exists.  The test is easy:

$ mkdir /tmp/some_new_dir
$ sudo mount -t tmpfs -o size=1M ThumbnailTest /tmp/some_new_dir

You can see what you've just done by using df.  It will probably the
last line of output.

$ df -h

Open up a folder with a large file, likely a movie or image.  Note the
thumbnail.  Now make a symlink to the large file in the temporary mount
and open the folder:

$ ln -s /path/to/large/file /tmp/some_new_dir
$ gnome-open /tmp/some_new_dir

Note the couple second delay while the thumbnail gets regenerated
despite the fact that it's the /same file/ (as evidenced by the
symlink).  Furthermore, for videos, the thumbnail likely won't have the
same image as the original, again, /despite being the same file/.

Finally, when you're done testing, you can simply umount the new temp
folder to get rid of it:

$ sudo umount /tmp/some_new_dir
$ rmdir /tmp/some_new_dir

-- 
thumbnailer unnecessarily recreates thumbnails
https://bugs.launchpad.net/bugs/370621
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