Task-Nr: QTCREATORBUG-2243

Task-number: QTCREATORBUG-2111

This makes sure styles are consistent for the editor and the quick fix
engine.

... for doxygen. Change logic for known empty keywords to be replaced
by an empty string.

Task-number: QTCREATORBUG-1854

Done with: Thorbjørn Lindeijer

Task-number: QTCREATORBUG-1919

Required refactoring of the search result window to show real trees of
search results.

The backend is the backend from the Locator filter, which is a bit
outdated now.

Reviewed-by: Roberto Raggi

Don't complete the current item when pressing special characters (e.g. `;') if the completion is automatically triggered.

Done-with: Erik Verbruggen

Without requiring ',' to be an electric character.

Task-number: QTCREATORBUG-1866
Reviewed-by: Roberto Raggi

Don't automatically trigger the completion when editing a word or when
in a comment or string.

Allowing any length more than 2 is too slow at the moment. We'd first
need to find a way to avoid recalculating the complete list of items
for every character while the key isn't matching anything.

Now it's possible to choose between having completion popup manually,
when triggered or always.

Similar behaviour as for the QML editor. However, for now without
removing the completion box when you have typed the whole word, since it
could still be useful for automatically inserting other characters.

Task-number: QTCREATORBUG-67

Reviewed-by: Erik Verbruggen

If a plugin requests asyncronous shutdown, the shutdown sequence does
not continue to deleting the plugins before it has sent a
asynchronousShutdownFinished signal. During that time an event loop
is running.