KFileWidget patch

[Albert Astals Cid]

Hi, i know i promised never to code another kdelibs patch, but hey, 
KFileWidget was failing and i had nothing better to do on a satuday night, 
so...

The problem:
 Using KFileDialog to open the second (actually not the first) suggested item 
in completion does not work, it always opens the first.

Steps to reproduce the problem:
 * Open okular
 * File->Open
 * Go to a dir with some pdf files beginning with a
 * Type a in the location field
      afoo.pdf
      abar.pdf
   appear on the suggestions box
 * Press down to select the second suggested entry
 * Press enter
 * afoo is opened

The problem is that setSelection was not beign called because the activated 
signal of the lineedit is not emited.

My patch changes a bit how things work, but i could not find any regression 
and it fixes the problem for me.

Comments?

Albert
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