Fix DnD FT on Windows:

* Fix helpers.py so URL is decoded correctly.
* Fix code in roster_window.py so the \0 that's alway the last file
  on win32 is ignored.

This also fixes and closes #2398.

src/common/helpers.py

@@ -585,10 +585,10 @@ def play_sound_file(path_to_soundfile):
 		exec_command(command)
 
 def get_file_path_from_dnd_dropped_uri(uri):
-	path = urllib.url2pathname(uri) # escape special chars
+	path = urllib.unquote(uri) # escape special chars
 	path = path.strip('\r\n\x00') # remove \r\n and NULL
 	# get the path to file
-	if path.startswith('file:\\\\\\'): # windows
+	if re.match('^file:///[a-zA-Z]:/', path): # windows
 		path = path[8:] # 8 is len('file:///')
 	elif path.startswith('file://'): # nautilus, rox
 		if sys.platform == 'darwin':

src/roster_window.py

@@ -3781,6 +3781,10 @@ class RosterWindow:
 				jid_dest)
 			uri = data.strip()
 			uri_splitted = uri.split() # we may have more than one file dropped
+			try:
+				uri_splitted.remove('\0') # This is always the last element in windows
+			except ValueError:
+				pass
 			nb_uri = len(uri_splitted)
 			# Check the URIs
 			bad_uris = []