Prevent function argument autocompletes from being highlighted

[sammorley-short]

Currently (v0.14.0) I am finding that after autocompletion of a function's parameters that the resultant argument is highlighted, rather than simply autocompleted. For example, see the below reproduction:

Hitting enter, one gets

Perhaps there is a reason that this is done to which I am not aware, but if so, it would be useful for there to be an option to deactivate this feature.