Mailto protocol handler vanished

[ChristophWurst]

Expected behavior

It should be possible for the app to register as mailto: protocol handler. This worked up until we migrated to Vue.

Actual behavior

There is no handler.

Solution

The app should [register a protocol handler]https://developer.mozilla.org/en-US/docs/Web/API/Navigator/registerProtocolHandler). We used to do this as soon as the app starts https://github.com/nextcloud/mail/blob/v0.11.0/js/app.js#L64-L73. But I was never a fan of this as it's making the first run experience worse with an additional dialogue.

Thus we should just add a setting to the bottom left. Like a button "Register as application for mail links". When the user clicks this, we run https://github.com/nextcloud/mail/blob/v0.11.0/js/app.js#L64-L73 (maybe without the theme thing because that API is ugly 🙈).

Mail app

Mail app version:

Anything after 0.11

[ChristophWurst]

@GretaD for testing you can use the example links at http://mc-computing.com/HTML_Examples/MailTo.htm. Once the protocol handler has been registered Mail should open when you click one of the links :)