Action extension for iOS (esp. Safari)

[ghost]

Consider adding/support an action extension similar to the one described in this StackOverflow discussion so that web logon forms can be filled easily in Safari, Chrome etc. easily.

[Ben-Voris]

As I understand them, an action extension would improve security by not putting the password in the clipboard.

[mmcguill]

This should be covered now with the addition of the Credentials Provider app extension in iOS12+.