Re: treesit indentation "blinking"

["João Távora" <joaotavora@gmail.com>]

João Távora <joaotavora@gmail.com> writes:

> I think it's easier that c++-ts-mode doesn't touch that variable at all
> and leave it set to "\n".  I can't see it being much use, with or
> without electric-pair-mode in the mix.

Following up on this, I have now tried c++-ts-mode for a while now and
can confirm this jumping-around-while-typing is terrible without
electric-pair-mode, and still pretty bad even with electric-pair-mode.

Here's just an example with emacs -Q + electric-pair-mode + c++-ts-mode

Start typing

i n t SPC m a i n ( ) SPC { RET

The buffer becomes

int main() {
  <- point here
}

So far so good.  Point is correctly indented at column 2 (because
electric-pair-mode has balanced the buffer and electric-indent-mode did
its thing on RET).

Type 'std'.  Nothing surpising happens, good.  Now type one ':' and see
the 'std:' be electrically indented to column 1, type the other ':' and
the 'std::' now jumps to column 2 again.

In bug#62412, Theo said is was OK with killing the custom setting of
electric-indent-chars in c-ts-mode.el and leave it set to the default.

Though a number of indenting problems would remain after that, at least
this one clear annoyance would be solved.  So if there are no
objections, I propose to apply this patch.

diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index 59eb9fc23e6..88360716381 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -956,10 +956,6 @@ c-ts-base-mode
   ;; Comment
   (c-ts-common-comment-setup)
 
-  ;; Electric
-  (setq-local electric-indent-chars
-              (append "{}():;,#" electric-indent-chars))
-
   ;; Imenu.
   (setq-local treesit-simple-imenu-settings
               (let ((pred #'c-ts-mode--defun-valid-p))

In master?  In emacs-29?

João