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bug#22983: syntax-ppss returns wrong result.

From: Dmitry Gutov
Subject: bug#22983: syntax-ppss returns wrong result.
Date: Thu, 7 Sep 2017 23:36:37 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:56.0) Gecko/20100101 Thunderbird/56.0

On 9/7/17 8:56 PM, Alan Mackenzie wrote:

The problem manifested during jit-lock. Do we understand why the (widen)
call inside font-lock-default-fontify-region didn't help?

I don't, not in detail, no.  Philipp might know.  But if syntax-ppss was
used whilst the buffer was narrowed, it likely corrupted its cache, and
that corruption remained after widening the buffer.

Details matter.

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