[gcmd-dev] Quicksearch improvement

[A. Gordon]

(last patch for today :-)

This patch improves the behavior of the quick-search popup.
It leaves the focus on the last file that matched the quick-search 
filter, even if a new filter is set and no file matches the new filter.

example:
Suppose you have some files in the current directory, among them are:
"aab"
"aac"
"aad"

You start the quick-search popup up and enter "aa".
The first file "aab" matches your filter and is focused.
If you now enter "q" in the quick search popup (making the filter "aaq") 
- no file matches the filter.

Current behavior removes the focus from "aab" and sets it to what ever 
file that was focused before the quick-search popup appeared.
This patch makes the focus stay on "aab" even though it doesn't match 
the new filter.
I think the new behavior is more friendly and intuitive.

Assaf.