e2c66ce48a
Currently, asynchronous search providers are expected to call startAsync() in getInitialResultSet()/getSubsearchResultSet(), which will trigger async mode until the search is canceled or updated. Switching between synchronous and asynchronous mode like this makes asynchronous search an implementation detail, but being transparent to the searchDisplay means that certain optimizations don't work as expected. Namely, updating asynchronous search results causes flickering, and the automatic selection never focuses asynchronous results. So change the API to require providers being either synchronous (with the current getInitialResultSet()/getSubsearchResultSet() methods) or asynchronous (with asynchronous variants), and handle asynchronous providers explicitly in searchDisplay. https://bugzilla.gnome.org/show_bug.cgi?id=663125
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