Instead of code duplication in LocationBar and WebSearchBar, create
the context menu from LineEdit.
Also actually create the menu, not just re-use the standardContextMenu.
The code to change color of host of url is completely new.
It doesn't use any paint hacks anymore. That means text in
locationbar will now be always rendered pixel perfect, as it would
with normal QLineEdit.
Cleanup in LocationCompleter. It is now using QCompleter in inline
mode to complete domain. It is still not ideal, eg. it refreshes
and show the domain completion with delay (job run in separate thread),
and sometimes it misses it completely.
WebSearchBar: Always complete when receiving suggestions. Fix issue
when suggestions were only showed after typing at least 2 characters.
- when leaving web widget, QWebPagePrivate generates fake
mouse move event, but unfortunately with bad coordinates.
So sometimes it just hovered a link and the link's url got
stuck in status bar message.
