Re: treesit indentation "blinking"

[Eli Zaretskii]

> From: Herman, Géza <geza.herman@gmail.com>
> Cc: João Távora <joaotavora@gmail.com>,
>  dgutov@yandex.ru, dancol@dancol.org,
>  casouri@gmail.com, theo@thornhill.no, emacs-devel@gnu.org
> Date: Thu, 30 Mar 2023 12:26:16 +0200
> 
> Type this example into a c++-ts-mode buffer (I used "emacs -Q"):
> 
> --8<---------------cut here---------------start------------->8---
> int main() {
> for (;;) {
> printf("Hello world\n");
> }
> }
> --8<---------------cut here---------------end--------------->8---
> 
> This is how it will be indented as I wrote it here. c++-ts-mode doesn't
> re-indent anything during typing, even though it had the chance to do
> that, because electric-indent-mode is enabled by default, and
> electric-indent-chars contains the necessary characters.
> 
> Or, another example. Put the "void foo() { }" part first into a
> c++-ts-mode buffer, then write the main function:
> 
> --8<---------------cut here---------------start------------->8---
> int main() {
> int a = 0;
> for (;;) {
> printf("Hello!\n");
> }
> }
> 
> void foo() {
> }
> --8<---------------cut here---------------end--------------->8---
> 
> Again, c++-ts-mode doesn't indent anything.
> 
> If you change the example to contain "void foo();" instead of "void
> foo() { }", then indenting happens during typing the main function.
> 
> If you try adding "int a = 0;" into the first example, then it will be
> indented at typing the ";". But then for loop is still not get indented,
> and the buffer will look like this:
> 
> --8<---------------cut here---------------start------------->8---
> int main() {
>   int a = 0;
> for (;;) {
> printf("Hello world\n");
> }
> }
> --8<---------------cut here---------------end--------------->8---
> 
> If you start by adding an empty comment, and then write the first
> example above the empty comment, the buffer will look like this:
> 
> --8<---------------cut here---------------start------------->8---
> int main() {
>   for (;;) {
> printf("Hello world\n");
>   }
> }
> 
> /**/
> --8<---------------cut here---------------end--------------->8---

Yuan and Theo, can you please look into these examples?  A simple
"C-c C-q" fixes the indentation, but the question is why it doesn't
happen while typing?