Selecting a search engine closes the popup

[Istador]

Currently, when a search engine is clicked on to select the default, the popup menu is closed.
For a better user experience, the popup should be left open.

The user should be able to change this behavior in the options (whether it should be open or closed after the click).

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Technical:

The popup menu needs to be closed, because it's content isn't updated otherwise (the default search engine is displayed differently from the others, changing the default isn't updating the already opened popup menu).

When the popup menu is opened right after closing it, the click handler for the search engine is still executed and is trying to work on the old popup menu which results in an Error.

Maybe the popup's content can be updated manually, or the old popup can be hidden instead of closed, to prevent the Error.