Comment 2 for bug 1082252

Subscribed mpt for design feedback, as he'll have to help us with some ideas. Currently the Software center wiki spec [1] states that:
* "Inside the leading end of the field should be a symbolic magnifying glass icon. Clicking the icon should focus the field and select its entire contents." - This is sort of incompatible with gtksearchentry, as that one does not have the search icon on the leading end, but on the trailing end, and only if it is empty.
So either we'll have to use another symbolic icon on the leading end (to be available for click and select contents) or ... (here's where anyone can drop some ideas on what to do)
[1] https://wiki.ubuntu.com/SoftwareCenter#The_search_field