Bram Moolenaar wrote:

> The other problem you mentioned, that the third argument is different
> every time, is that really every time, also when still inside the same
> match?  I think that requires a syntax item that spans more than
> one displayed character.
>
> When doing the same line again, syncing happens and will set new IDs for
> the matched items, that is normal.

Hi Bram

The 3rd value returned by synconcealed() is different for each call,
even when inside the same match.  In the code review comments
I had this example with a help page that contains concealed text:

$ vim -u NONE -c 'set conceallevel=1|syntax on|help'
:echo synconcealed(1, 1)
[1, '', 33]
:echo synconcealed(1, 1)
[1, '', 43]
:echo synconcealed(1, 1)
[1, '', 53]

It's still happening with the latest vim-8.0.662 but it now returns
different values somehow:

$ vim -u NONE -c 'set conceallevel=1|syntax on|help'
:echo synconcealed(1, 1)
[1, ' ', 31]
:echo synconcealed(1, 1)
[1, ' ', 37]
:echo synconcealed(1, 1)
[1, ' ', 43]

That makes the 3rd value returned by synconcealed() unusable.

Regards
Dominique

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