Auto-completion suggestions are not cleared inside a lambda argument

When typing a function call where one of the arguments is a lambda function, QtCreator does not remove the auto-completion suggestion about the enclosing function parameters even when the cursor is within the lambda body.

See the attached screencast where I'm typing `std::thread` with an inline lambda.

The stale auto-completion suggestion is useless within the lambda body and interferes with code navigation as it intercepts arrow key presses. I think, it should be cleared even earlier, when the square bracket for the lambda capture is opened, as this creates a separate context for captures.