Re: [RFC] position caches

[Dmitry Antipov]

On 03/12/2013 09:08 PM, Eli Zaretskii wrote:

> Therefore, bidi.c needs to determine the paragraph start each time it
> enters a new paragraph.  It needs to do that even if the buffer didn't
> change a bit, because a new paragraph can have a different base
> direction.  The bidi_it->new_paragraph flag is set when the iteration
> goes out of a paragraph or when the iterator is re-seated far away of
> its current position.  In those cases, xdisp.c calls
> bidi_paragraph_init, which in turn calls bidi_find_paragraph_start.
> You cannot return the beginning of previously found paragraph just
> because the buffer didn't change.

I do not understand this. I'm trying to cache not just the previously
find paragraph start, but the previously find paragraph start against
[bidi_it->charpos, bidi_it->bytepos] buffer position; so if bidi_it is
moved in any way, cache becomes invalid even if the buffer is not changed.

Dmitry