Change icon for file type

[Duncan]

Aleksey Midenkov posted on Tue, 10 Jun 2014 17:54:48 +0400 as excerpted:

> Is it possible to apply changes without relogin?
> 
> In file context menu Properties -> File Type Options I click on icon.
> Icon selection dialog opens. I select icon -- in Edit File type it
> changes to new icon. Then I click OK and in Properties there is still
> old icon! What I found useful is to delete
> /var/tmp/kdecache-$USER/icon-cache.kcache and then relogin. Is it
> possible to see changes without these actions?

Answer below, but first...  Please turn off the HTML when posting to 
mailing lists.  It's controversial as a lot of folks consider it a 
potential malware/spyware vector (webbugs, among other things) and spam 
indicator and thus chose to use clients without HTML parsing enabled.  On 
many of these the HTML mail portion simply looks ugly.  As it's often the 
old-time regulars that know a lot about a subject that have this 
viewpoint and they are often on enough lists that they are picking and 
choosing what to reply to already, frustrating or offending the people 
you want a good answer from isn't a particularly good idea, as they 
killfile such messages or simply ignore them and move on to others 
without the problem in the first place.

To answer the question, kde uses text-based configuration files (instead 
of a binary-based registry) for ease of editing, but keeps a runtime 
binary cache called the Kde SYstem COnfig CAche, aka ksycoca, for 
responsiveness.  There's two apps involved in its maintenance, kde 
daemon, aka kded, that notifies running apps when ksycoca changes at 
runtime, and kbuildsycoca, that normally runs at startup to collect the 
current config and update the ksycoca binary cache to the latest config.

If for some reason a configuration change isn't detected properly at 
runtime, usually running kbuildsycoca manually fixes it.  Note that for 
kde4, it's actually kbuildsycoca4, and that normally it does a fast but 
not as thorough "incremental only" scan.  To do the really thorough scan, 
use the --noincremental option.

So try running...

kbuildsycoca4 --noincremental

... and see if that helps.  Of course you can try it without
--noincremental first if you like and it'll probably work, but using that 
option is normally recommended just in case.  Note that if you run it in 
a konsole, you may well get a bunch of complaints about minor errors in 
*.desktop files, etc, but these are for developers and as a user you can 
generally ignore them.

As you're dealing with icons you /may/ need to delete the icon cache AND 
run kbuildsycoca4, but that should do it without a restart.  If dolphin 
(or plasma or konqueror or whatever, you didn't mention what app) doesn't 
update at that point, consider filing a bug, as it should.

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

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