frames/middleware/query_preserver.js

/**
 * This middleware preserve some global query parameters during the navigation,
 * like the theme color or the parent organization
 */

const PRESERVE = ['parent', 'theme', 'view']

export default function ({ from, route, redirect }) {
  let redirected = false
  for (const param in from.query) {
    if (PRESERVE.includes(param) && !(param in route.query)) {
      route.query[param] = from.query[param]
      redirected = true
    }
  }
  if (redirected) {
    redirect(route)
  }
}