Invalid parentheses added to signal/slot names by autocomplete when using the Clang model

Preconditions:

• Clang model is enabled.
• New signal-slot connection is used.

Autocomplete not only completes the signal/slot name but also adds "()" when the suggested signal/slot is accepted in the pop-up with Enter key.

See the attached screenshots for completion suggestion and wrongly added parentheses after accepting the suggested function. (In "autocomplete_suggestion.png" deleteLater is already inserted by the code model before accepting the suggestion because it was the only possibility based on the prefix.)