Support enterKeyHint for Mobile device

[clemdesign]

Hello,

I would like to propose the support of enterKeyHint attribute for mobile device.

There is an example of implementation here (Look for enterkeyhint).

Problem:

On iOS devices, the keyboard use "Back" label for "Enter" key. It is not appropriate for editing. And iOS seems not propose the "Enter" label for the keyboard (after many tests and I'm not found spec on this).

So, I propose to add an option enterKeyHint to Editor of this library, which set the attribute enterkeyhint of the ProseMirror editor.
This option will allow to define all possibles values from spec.
And Integrator can choose the right label according context.

I prepared an PR and can propose it.

Thanks.

[sibiraj-s]

I prepared an PR and can propose it.

Sure.

[clemdesign]

Done: #366