Version:           4.6 (using KDE 4.6.5) 
OS:                Linux

When I am saving a page in firefox, the KDE file dialog opens.
And there when I change anything in the Name field, the Filter
field is automatically changed to "All files", which means that
the page won't be saved completely (incl. all the images etc)
any more.

This was introduced somewhere between 4.6.0 (where it works)
and 4.6.5 (likely even before 4.6.4, can't verify now).

Reproducible: Always

Steps to Reproduce:
- Open page in firefox
- Ctrl+S
- RightArrow
- <arbitrary character> (modify name.html to name2.html)


Actual Results:  
Filter field changes to "All files"

Expected Results:  
Filter field should remain as it was, "Web Page, Complete"

In "native" firefox dialogs it works fine.
Cf https://bugzilla.mozilla.org/show_bug.cgi?id=683136