GTK UI has issues with Unicode file/directory names and .torrent files

[IAmTheClaw]

While the daemon handles Unicode just fine, the GTK UI has problems selecting files/directories with most non-ASCII characters in dialogs. I have been dealing mainly with Japanese characters, but I'm sure it applies to most Unicode characters.

In the torrent creation dialogs, it is impossible to create a usable torrent file from a directory with Unicode characters in its name. It will show in the listing, but the Open button doesn't work if such a directory is selected (and it renders the Cancel button useless once pressed as well). Closing the window with the X button at the top works, though. The directory will appear in the Create Torrent dialog, but no piece size is determined (just like when there's no directory selected). It can save the .torrent file with the Unicode characters properly, but the file is very small and seems to be unusable.

A related issue is that the UI cannot open .torrent files with Unicode characters via the OS "open file with" or via download. In the former case, the UI silently ignores the error and in the latter case, it says it cannot find the file. Downloading the .torrent to disk and then opening the file through the "Add Torrent" dialog works, however.

OS: Windows 7 x64

Deluge daemon and client are both version 1.3.5.