The very same problem exists on Mint 15 (based on 13.04) and Thunar 1.6.2.
I actually run Nautilus to work around the problem and copy the files.
The problem might be in lower levels.
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This bug still exists in latest stable precise and more irritatingly with
almost any application.
For instance, I try to login to a web page in Firefox. I don't remember the
password, so I start Keepass from Dash. I type my password in Keepass, hit
Enter (or at least I think I do) and guess
