Support GET from with Turbolinks.

turbolinks_form_get.js

import Turbolinks from 'turbolinks';
Turbolinks.start();

document.addEventListener('turbolinks:load', function(event) {
    for (let form of document.querySelectorAll('form[method=get]:not([data-remote=true])')) {
        form.addEventListener('submit', function (event) {
            event.preventDefault();
            const entries = [...new FormData(event.target).entries()];
            const actionUrl = new URL(event.target.action);
            const currentUrl = new URL(location.href);
            // if pathname not changed, hand over per parameter to next page.
            if (actionUrl.pathname === currentUrl.pathname && currentUrl.searchParams.has('per')) {
                actionUrl.searchParams.set('per', currentUrl.searchParams.get('per'))
            }
            entries.forEach(entry => actionUrl.searchParams.set(...entry));
            Turbolinks.visit(actionUrl.toString());
        });
    }
});