Re: automatic redraw for multi-line syntax highlighting patterns

On Sat, Dec 28, 2019 at 12:32 AM Tom M <7tommm@gmail.com> wrote:

Hi,

the docs state (:help syn-multi-line) that syntax highlighting with multi-line patterns "mostly works as expected".  I am not sure if this "mostly" includes automatic highlighting change of a multi-line syntax group when it's modified. Especially as soon as the pattern's end is destroyed. For example, take the commands of a session file ~/tmp/s.vim:

call append(0, ['( comment?', ')'])  syntax sync fromstart  hi link m Comment  syntax match m /(.*\n)/  

They give us two lines highlighted as a comment (:hi Comment):

( comment?  )

Now, let's change the ')' into an 'x' via "2gg0rx". The test in the two lines does not match the defined syntax group anymore. But the display does not reflect this change right away. Instead I get something that's displayed partly as a comment (line 1) and partly as normal text (line 2):

( comment?  )

 Typo here. This last screen looks, of course, like this:

( comment?  x

Sorry for the confusion.

Tom

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