desktop items with special chars in filename don't show in gnome-panel untill relog

Binary package hint: gnome-menus

When you install/copy some .desktop file into /usr/share/applications, it
usually shows immediately in Applications menu. But this doesn't work when the
.desktop file has some non-standard character in filename (eg. app+.desktop,
app=.desktop, appí.desktop, appš.desktop, ...). For these .desktop files you
have to log out and log in again into gnome session to see these items in
Applications menu. I have found out this when installing this package:
http://packages.debian.org/unstable/net/linuxdcpp
and saw these symptoms (it uses "dc++.desktop" menu file).

Notice: I use Ubuntu 7.04, not Debian (forementioned is debian package), but it
doesn't matter, try simply create your own .desktop files in
/usr/share/applications. It a general problem.

Steps to reproduce:
 1. $ cd /usr/share/applications
 1. Find some .desktop file, eg. firefox.desktop
 2. $ cp firefox.desktop firefox2.desktop
 3. Now you have 2 firefox's in menu.
 4. $ rm firefox2.desktop
 5. Original state
 6. $ cp firefox.desktop firefox+.desktop
 7. Now you have only 1 firefox in menu. Where's the difference? In the "+" in
filename.
 8. Log out, log in, now you have finally 2 firefox's.

Happens:
 Everytime.

Expected result:
 Desktop files with non-standard filenames also appears immediately.

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Note: This bug has been reported in Gnome Bugzilla:
http://bugzilla.gnome.org/show_bug.cgi?id=441407
but was marked as Ubuntu-specific.

Comment from Vincent Untz:
I've tested a bit, and it seems to only happen in ubuntu because it's using the
gnome-vfs backend, which is not upstream. Somebody should fix the downstream
patch. Can you file a bug in launchpad?