Actually it should be ctrl-space (which invokes the intelligent code completion.
ctrl-W is just word completion (any word that can be found in the editor(s)).
That aside, the only auto invoke that exists is, if you press a ".". I.e.
MyObject.
Then it will show you the methods/properties of that object.
There is a slight delay. It only opens if you do not press another key for like a half a second. You can change that wait time.
For more see
https://bugs.freepascal.org/view.php?id=33054