bug#56682: Fix the long lines font locking related slowdowns

[Gerd Möllmann]

Gerd Möllmann <gerd.moellmann@gmail.com> writes:

> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>
>>> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>>>
>>>> Font-lock       Output
>>>> ------------------------------------------------------------
>>>> on              GCs: 14 Elapsed time: 7.880788 seconds
>>>   on, and large gc-const-threshold
>>>                  GCs: 0 Elapsed time: 7.720531 seconds
>     on, without scroll-bar
>                    GCs: 15 Elapsed time: 5.574946 seconds
      on without scroll-bar, auto-composition-mode off
                     GCs: 15 Elapsed time: 4.166101 seconds
>>>> off             GCs: 2 Elapsed time: 0.885791 seconds

Hm.