When a listview is filtered, it's not very visible or apparent that the list is
actually filtered:

(1) The only indication that a successful filter operation has occurred is that
the filter text is in the text box. You also don't know how the full size of the
list compared to the filtered version. Eg if filtering a 1,000 system list
returns 200, I'll know I have 200 systems visible but the 1,000 number isn't
anywhere on screen. If you don't know the full size of the list how can you even
tell it is filtered? :) (see attached screenshot.)

(2) Unsuccessful filtering attempts remove filtering controls and don't have any
mechanism to clear the unsuccessful filter (besides page reload) (see bug 239607)

(3) The only way to clear a filter it is to empty out the filter text box and
click the submit button.

PROPOSED USE CASE to fix this
=============================

Scenario: Say I have a list of 1,000 systems, and I have let's say 200 systems
with the term 'wkstation' in their name. I need to do some work on systems in
this particular namespace, and only those systems. 

(1) I go to my system list. I get a 100-page list of 1,000 systems.

(2) I filter for 'wkstation' in that system list, and I get a 20-page list with
200 systems in it. A list-info (or similar) box also appears above the list
indicating the following: "The list of 200 systems below is filtered - only
systems with the term 'wkstation' are displayed below. _Clear this filter and
view all 1,000 systems_"  (feasibility?)

(3) I click to move to page 2 of the list and the list-info box still appears.

(3) The page count (e.g., "1 - 1 of 1") for the list would instead say "1-10 of
200 (1,000 total) (2 selected)" (yes this is kind of confusing but better than
nothing)

(4) I clear the filter (using a clear button?) and the list-info box disappears.
I now see all 1,000 systems. The page count returns to "1-10 of 1,000"