Quick Nav result tooltips should only show the space name

Quick Nav tooltips were changed in CONF-13471 to show the space name, to help distinguish between pages with the same titles.

This means that now the tooltip shows both the space name and the page title. I think this is confusing - too much information being presented, and not obvious what the information is. It would be improved by showing only the space name on the tooltip.

Alternatively, if the full page title does need to be shown due to truncation issues, then the space name should be distinguished in some way - different colour, different font, bolded, etc.