bug#15045: Point jumps inappropriately around time of Semantic lexing

[martin rudalics]

> The main problem is that speck narrows the buffer before calling
> `accept-process-output'. If that happens while the
> time-display-event-handler runs, you suddenly see a narrowed buffer,
> which is soon widened again. Pretty scary.

Very annoying, at least.

> The fix would be to undo any narrowing and restore point before calling
> `accept-process-output'.

Very inconvenient, at least.

Many thanks for the explanation and the investigative work, martin