Turbo: Redirects cause double rendering

Problem/Motivation

At the time of writing, a redirect causes the turbo:before-render and turbo:render to trigger twice, which causes behaviours to detach, attach, detach, and attach again.

Steps to reproduce

Click a redirect link with the browser dev tools console open, looking at debug messages we have in our JavaScript.

Proposed resolution

Doing a search for "redirect" in the Turbo issues yields a few results that seem to indicate this is a known problem with Turbo and not on our end:

• turbo:visit is dispatched twice on redirect
• Do not dispatch multiple visit events on redirect visit (see comments)
• Propose a replace visit on redirection (see comments)

Remaining tasks

Work around it ourselves and/or wait for Turbo to implement a fix.

User interface changes

None other than hopefully no weird breaking due to double detach/attach.

API changes

None.

Data model changes

None.