Fals positive for file comparison after copy

Version information

Thunar master (893eba10)

Steps to reproduce

• Connect smartphone via mtp://
• Copy some picture (*.jpg) from the smartphone to some local folder. (The bug seems to only trigger for pictures)

Current behavior

A dialog pops up: "Copied file does not match with the original" [skip][repeat][abort]

Expected outcome

Since the files do have exactly the same size, and seem not to be corrupted in any way, there should be no such dialog

Additional information

Related Commits: e62022e9 (!1471)

@kelnos, maybe you have an idea why the compare could fail for mtp locations? (Currently out of time, did not look into the code yet. Have to check if the bug as well can be seen for other gvfs protocols)