xflock4 screensaver support

[Martin Sourada]

Hi all,

I believe many people may call this nitpicking, but it has been a
long-standing issue that xfce isn't able to work with any other
screensaver than the most simple ones or xscreensaver without changing
xflock4 shell script. I don't mind that xscreensaver is simple and ugly
-- it's just an ui for locking the screen for me, but it has severe
usability problems. I noticed two:
  * I cannot tell which keyboard layout I'm using. Is it US, is it CZ?
    Is it qwerty, qwertz, dvorak, whatever?
  * I cannot switch users that way (imagine a second person coming to
    a locked computer).

I solved these issues easily by switching to mate-screensaver, but as
it's not officially supported by xflock4, I have to edit the script
every time I update xfce4-session package which is suboptimal,
especially given, the patch is fairly simple.

Can we consider adding support for all fedora/epel included
screensavers into xflock4 with such simple patch, until xflock4 is
rewritten upstream?

Reference bugs:
https://bugzilla.xfce.org/show_bug.cgi?id=10217
https://bugzilla.redhat.com/show_bug.cgi?id=1166227

Regards,
Martin