After copy operation, sometimes not all files are selected
The file size seems to matter.
I tested with pictures and pdf files, 1 to 2MiB each. Like that many files are not selected. Enable/disable thumbnails seems to make no difference.
Happens only on copy+paste. Not on cut+paste. Happens as well on thunar 1.8.x and thunar 1.6.x.
Possibly related: #272