FTP credentials form doesn't display the SSH2 fields on the Updates screen

[afercia]

The FTP credentials form is used both in the Plugins/Themes screens (where it's in a modal window) and in the Updates screen. When it's displayed inside the modal, selecting the SSH2 radio button makes the Authentication Keys fields appear:

On the Updates screen instead, when selecting the SSH2 radio button nothing happens:

Worth reminding before 4.6 the two Authentication Keys fields were in a different position (above the radio buttons) and always displayed on the Updates screen.

[afercia]

39057.diff​ should be good to go. Note: couldn't test wp.updates.showErrorInCredentialsForm(), actually I'm not sure how it is supposed to work :)

[afercia]

I'd propose to consider this for 4.7.1.

[dd32]

In 39656:

Updates: Remove a stray " from a tag.

Props afercia.
See #39057.

[dd32]

In 39657:

Updates: Show the Authentication key settings after selecting the SSH transport in both the modal, and also on the plugin/theme updates screen.

Props afercia.
Fixes #39057 for trunk.

[dd32]

In 39658:

Updates: Show the Authentication key settings after selecting the SSH transport in both the modal, and also on the plugin/theme updates screen.

Props afercia.
Merges [39657] to the 4.7 branch.
Fixes #39057.

[dd32]

In 39689:

Updates: Properly define $filesystemForm to handle error in modals.

Ammends [39657].
See #39057.

[dd32]

In 39690:

Updates: Properly define $filesystemForm to handle error in modals.

Amends [39657].
Merges [39689] to the 4.7 branch.
See #39057.