xfce4-appfinder doesn't handle escaping in desktop file

Example of an error message:
 Working directory "/home/krsch/hdd/games/The\sLast\sFedaration/game" does not exist. It won't be used when spawning "/home/krsch/hdd/games/The\sLast\sFedaration/game/LastFederationLinux.x86_64".xfce4-appfinder: failed to execute: Failed to execute child process "/home/krsch/hdd/games/The\sLast\sFedaration/game/LastFederationLinux.x86_64" (No such file or directory)

File "/home/krsch/hdd/games/The Last Fedaration/game/LastFederationLinux.x86_64" does exist and is executable.

As mentioned in http://standards.freedesktop.org/desktop-entry-spec/latest/ar01s03.html , escape sequence \s should be treated as a space in string fields. Unfortunately. xfce4-appfinder ignores this rule.

I use Ubuntu 14.04.1 LTS and xfce4-appfinder 4.10.1-1

The desktop file that triggered the above error is:
 [Desktop Entry]
 Type=Application
 Name=The Last Fedaration
 Comment=The Last Fedaration (GOG.com)
 Icon=/home/krsch/hdd/games/The\sLast\sFedaration/support/gog-the-last-fedaration.png
 Exec="/home/krsch/hdd/games/The\sLast\sFedaration/game/LastFederationLinux.x86_64"
 Categories=Game;
 Terminal=false

Reassigning to xfce4-appfinder.

Created attachment 8240
escape.diff

@bluesabre, the attached unescapes the \s sequence, but I'm not sure this is the best approach (it does not handle \n, \t, \r, and \\). I also tried g_strcompress but it didn't work as I expected.

xfce_appfinder_model_execute is similar to garcon_gtk_menu_item_activate_real, but the latter also does not deal with escaped sequences.

So I think garcon could provide the something like garcon_menu_item_get_escaped_command so both functions would benefit.