Rebuild archlinux kwin with 3-fingers gesture overview instead of 4

archlinux_kwin_3fingers.sh

#!/bin/bash
REPO=https://gitlab.archlinux.org/archlinux/packaging/packages/kwin.git

set -euo pipefail
DIR=$(mktemp -d)
trap 'rm -rf "$DIR"' EXIT
git clone --depth=1 -b $(pacman -Q kwin | cut -d' ' -f2) "$REPO" "$DIR"
cd "$DIR"

# 3-fingers gesture for overview
if ! grep -q '^prepare()' PKGBUILD; then
  echo -e '\nprepare() {\n}' >> PKGBUILD
fi
sed -i '/^prepare()/a\  ( cd "${pkgname}-${pkgver}" ; sed -i "/addTouchpadSwipeGesture/s/4/3/g" src/plugins/overview/overvieweffect.cpp )' PKGBUILD

# Remove kdoctools.
sed -i '/^\s*makedepends=(/,/)/{/kdoctools/d}' PKGBUILD

# PKGBUILD is edited, build now.
makepkg -si --skippgpcheck