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I recently made the move from Gnome to XFCE to avoid the mess that is Gnome3.  It's been smooth sailing for a couple weeks, so I did a :
# pacman -Rsc gnome
to get rid of the old gnome cruft.  Apparently that was a mistake.  My theme is gone, and it's gone back to the basic, ugly, blocky style.  Also, nearly all my icons are gone in the menu, desktop, and thunar.
Most troubling is that most of the stuff under Menu -> Settings is gone. This includes Appearance, so I can't even go in there to see what's missing/fubared.
I'd appreciate any hints as to what I did and how to fix it.
Thanks for the help. I'm fairly new to Arch, but not new to Linux (10+ years).
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(sudo) pacman -S xfce4-settings will do the job for you. I don't know why (never looked for the reason) but it goes when you Rsc gnome. You should have the pkg still if you didn't do a -Scc. Hope it helps..
Linux makes you a better person
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Gnome and XFCE both use GTK themes, so it seems that your themes may have been deleted.
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cat /var/log/pacman.log | grep theme | grep removedOffline
Reinstalling xfce4-settings took care of it. All my themes and things are still intact, and everything works fine after reinstalling that package.
Seems like a bug, no?
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I did a little searching and didn't see a bug report for it, so I filed one:
https://bugs.archlinux.org/task/24746
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No not a bug. 
xfce4-setting  depends on gnome-icon-theme;  which is part of gnome group. pacman -Sg gnome.
Maybe look into pacman -Rh at what cascade (-c) does.
PLEASE read and try to FIX/FILE BUGS instead of assuming other have/will.
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It looks like this is the expected behavior of the -c argument. It removes dependencies, even if they are needed by other things.
Thanks for the help, and excuse the newbie mistake. :-)
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Thanks for the help, and excuse the newbie mistake. :-)
We've ALL made those type of mistakes (newbie)   at one time or another.   Pacman flags are WELL worth studying and learning. 
AT least you didn't 'break' you system.  Call it a learning experience.  
Welcome to Arch, please mark this thread as 'Solved' if you have no further related issues/questions. 
See HERE for instructions if needed.
PLEASE read and try to FIX/FILE BUGS instead of assuming other have/will.
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