Created attachment 161995 [details]
Unpack to a dir, which you will use to recreate the error while uploading.

1. Do unpack the attachment into a separate dir.
2. Goto any web app and initiate upload, which will then show the FILE UPLOAD dialog, which you should point to the directory that we just created and you should see a bunch of images which all begin with "82" in the filename.
3. type "82" which will initiate the search function and immediatly, while the searchbox is visible, try to go down with arrows and the thumbnail will not be generated correctly (it falls behind one image while scrolling down).

This is severe problem for us who use Gnome while administering our websites.

We only recently found out about the problem and the investigation showed the bug in the FILE UPLOAD thumbnail generator while the searchbox is visible. When you find something and remove searchbox with ESC then all thumbnail generator is just fine.