Submenu for search history - easy search for typed entries

[Gregor]

Now when you want to use some other than default search engine for already typed search entry you have to do 4 clicks:

1. click the default favicon on the search field to open search engines list
2. choose another search engine
3. click Show Search History button on the right side of the search field
4. choose search entry from the list

My feature request is to add search engines submenu for search history, which shortens the repeat search to a minimum of 2 clicks:

1. click Show Search History button on the right side of the search field
2. hover over search entry in the list and click search engine from the pop-up submenu