Listbox: select all option does not work well when using the filter

[Dekel-Cohen]

I'm submitting a ... (check one with "x")

[x] bug report => Search github for a similar issue or PR before submitting
[ ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
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Plunkr Case (Bug Reports)
I tried to build a Plunkr Case for it but i encountered importing the Listbox module.
Any help with it will be much appreciated.

Current behavior
Filter the multi-select, you will see that the list box shows all items that contains the entered filter
but clicking will only select items that begins with the entered filter.

Expected behavior
Select-all should select all options you currently see on the listbox.

Minimal reproduction of the problem with instructions

1. Go to the documentation of Listbox:
   http://www.primefaces.org/primeng/#/listbox
   use the Advanced (Multiple, Checkbox and Filter) demo.
2. In the filter enter the letter 'r' => (you will see only options that contains the letter 'r', which is good)
3. Click on select-all => only Rome will be selected.

What is the motivation / use case for changing the behavior?
We think that selecting all items once you use the filter if a very common
and important case in this component.
It definitely the case for us...

[cagataycivici]

@Mrtcndkn This does not fix that, it just changes the way filtering is done. Issue is still there.

[cagataycivici]

My bad, it fixes it, sorry.

[kaushikmeduri]

Can any one advise which version has this fix in https://www.primefaces.org/downloads/

[kaushikmeduri]

Can any one advise which version has this fix in https://www.primefaces.org/downloads/

I opened new ticket primefaces/primefaces#4337