Doesn't try to use installed desktop client on Chromium browsers on macOS

[directhex]

Describe the bug I'm running macOS 12.0.1, and use Edge as my daily driver. I was provided a matrix.to link, picked a client (Element), opted to download it rather than use via the web, and did all the required signup to have the client working. When I tried the matrix.to link again, clicking continue made no effort at all to actually invoke my local app, in either Edge or Chrome - however, with Safari, it asked to open in the app. I also tried Edge on Ubuntu, which called xdg-open as expected. The Mac+Chromium case is specifically the broken one

To Reproduce Steps to reproduce the behavior:

1. Install Chrome or Edge or something on a Mac
2. Install Element desktop client
3. Click https://matrix.to/#/#matrix-curious:matrix.org and hit continue on Element

Expected behavior Something approximating the Safari behaviour

Screenshots

Desktop (please complete the following information):

• OS: macOS 12.0.1
• Browser: Edge 95.0.1020.53, Chrome 96.0.4664.55
• Version: Element version: 1.9.4

[t3chguy]

Duplicate of https://github.com/matrix-org/matrix.to/issues/230