The final comments of this bug indicate that it is a threading issue that should have addressed by the ft-font locking introduced during the 1.3 dev cycle. The asssertion itself has been removed in favour of propagating the error, but that seems orthogonal to the underlying bug.
The final comments of this bug indicate that it is a threading issue that should have addressed by the ft-font locking introduced during the 1.3 dev cycle. The asssertion itself has been removed in favour of propagating the error, but that seems orthogonal to the underlying bug.