bug#6952: jit-lock with default, small chunk-size causing incorrect fontification in cc-mode

[Daniel Colascione <dan.colascione@gmail.com>]

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I've attached a file that demonstrates incorrect fontification with
cc-mode and jit-lock used together -- the last function in the file is
not fontified as a function when a file is first visited with
jit-lock-chunk-size equal to its default 512. If I change that to
32768 or change some of the whitespace in the fiile, fontification is
correct again. I've attached the file because the testcase is
whitespace-sensitive.

Presumably, the underlying cause is jit-lock asking cc-mode to start
or stop fontification in an unexpected place.

[-- Attachment #2: foo.c --]
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type
abcabcabcabcabcabcabc (
              typetypetypety paramparampa,
              typet* paramparamparam);

type
dsflkajfklafjdaslkfjasfdd (
              typetypetypety paramparampa,
              typet* paramparamparam);

type
vcxkzvjxcdflasfdsafdt (
         typetypetypetypetypet param,
         typet paramparamp,
         typet* paramparamparampa
    );