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Undercurl in Neovim running in Tmux and Konsole

A HOWTO for getting undercurl support in Neovim running in Tmux and Konsole.

Konsole

You need to be running Konsole v22.11.80 or newer (undercurl support was introduced in this commit on 2022-08-26).

Tmux

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#!/bin/bash
#
# Steps to build GCC 10 on Debian Buster.
#

set -e -x

# Install all dependencies.
export DEBIAN_FRONTEND=noninteractive
apt update

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#!/bin/bash
#
# Steps to build Python 3.9 on Debian Buster, including all modules.
#

set -e -x

# Install all dependencies.
export DEBIAN_FRONTEND=noninteractive
apt update

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#!/usr/bin/env python3
#
# Limits the maximal virtual memory for a subprocess in Python.
#
# Linux only.
#

import subprocess
import resource

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//
// Limits the maximal virtual memory of the process to half of the total
// amount of RAM on the system.
//
// Linux only.
//
// Compilation:
//
//   gcc -std=c11 -pedantic limit-virtual-memory.c -o limit-virtual-memory
//

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// $ g++ -std=c++17 -pedantic -Wall -Wextra visit-variant.cpp -o visit-variant
// $ ./visit-variant

// Implementation:
//
// Based on http://en.cppreference.com/w/cpp/utility/variant/visit

#include <variant>

template<typename... Ts> struct make_overload: Ts... { using Ts::operator()...; };

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// We need to use Vec::into_iter() instead of Vec::iter() to create a consuming
// iterator that moves each value out of the vector.

fn main() {
    let v = vec![1, 2, 3];
    let v: Vec<Option<i32>> = v.into_iter().map(Some).collect();
    assert_eq!(v, [Some(1), Some(2), Some(3)]);
}

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// Item::new() accepts both &str and String. When called, it creates a copy of
// the parameter and uses it to initialize the returned item.
//
// The trick is in the use of the Into trait:
// https://doc.rust-lang.org/std/convert/trait.Into.html

struct Item {
    id: String
}

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// $ g++ -std=c++11 -pedantic -Wall -Wextra cpp11-string-literal.cpp -o cpp11-string-literal
// $ ./cpp11-string-literal

#include <string>

// Emulates the standard std::string literal ("..."s) from C++14. Since 's' is
// reserved by the standard, we have to use '_s' instead of 's'.
std::string operator "" _s(const char *str, size_t length) {
    return std::string(str, length);
}

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// $ g++ -std=c++14 -pedantic -Wall -Wextra double-dispatch.cpp -o double-dispatch
// $ ./double-dispatch
//
// Also works under C++11.

#include <iostream>
#include <memory>

#if __cplusplus == 201103L
namespace std {