[vim/vim] Rendering error in matchparen (Issue #20791)

[rendcrx]

rendcrx created an issue (vim/vim#20791)

Steps to reproduce

static void codegen_stmt(struct stmt_t *stmt)
{
	switch (stmt->kind) {
	case STMT_ASSIGN:
		codegen_assign(stmt->assign);
	case STMT_RETURN:
	default:
		assert(0);
	}
}

error.png (view on web)

Pressing o on the opening brace of a function definition may cause a brief highlighting glitch.

I can reproduce this with vim --clean -c "runtime! plugin/matchparen.vim"

Expected behaviour

There should be no incorrect highlighting.

Version of Vim

9.2.735

Environment

Operating system: Linux archlinux 7.1.2-arch3-1
Terminal: Kitty
Value of $TERM: xterm-kitty
Shell: /usr/bin/bash

Logs and stack traces

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[Mao-Yining]

mao-yining left a comment (vim/vim#20791)

Could you provide video or ascii cinima? Can't reproduce.

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[rendcrx]

rendcrx left a comment (vim/vim#20791)

https://fileshot.io/f/c7d39a0f44ee5a409ea89e575626d407#k=bxnDItlZDR_bnn6JuQ0iO1FW0REXX8u-CY7u0rJ5dbw&h=kY2jlpicMdMD1gNsCwkpM0Z0sO6lO2gQP0IvHg4KQyI

@mao-yining It rendered incorrectly in the video the last time I pressed 'o'.

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[rendcrx]

rendcrx left a comment (vim/vim#20791)

https://github.com/user-attachments/assets/693bce2b-d490-447c-8462-d63308fcfdd5

1. vim --clean -c "runtime! plugin/matchparen.vim"

1. Repeatedly press o

A rendering error occurs on the final o keypress shown in the video.

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