Patch for bug 62672: Tree view rooted at devices:/ malfunctions

[Wilco Greven]

Hi,

Below is a patch which should fix bug 62672. Items in redirected subdirs where 
listed at the toplevel because the treeview doesn't handle the redirection 
correctly. When a redirection happens a clear(url) signal is sent first by 
the dirlister. The treeview handled the clear signal by removing the entire 
directory instead of clearing it. 
The patch fixes this by splitting up the removeSubDir method in a clearSubDir 
method and a smaller removeSubDir method which calls clearSubDir. 
One thing I'm not sure about is whether the directory should be removed from 
m_urlsToOpen and m_urlsToReload in the clear or the remove method.

Bug report: http://bugs.kde.org/show_bug.cgi?id=62672

Ok to commit?

Greetings,
Wilco
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