[RMmobile] Add Enter.key detection to the Title block

[daniloercoli]

This PR adds Enter.key handling to Title block, and gives the ability to add a new block after it.

This PR set multiline=false, and detect the Enter.key with the default onSubmitEditing prop given by the underlying RN component. It adds a new default empty block after the current. (Default logic on the web).

onSubmitEditing is a very reliable way of detecting Enter.key on TextInput with multiline = false, and works on both HW and SW keyboard without the necessity of implementing hacks with TextWatchers and keyListeners - https://facebook.github.io/react-native/docs/textinput#onsubmitediting

Note: onSubmitEditing does hide the keyboard at the moment, it's a default behavior (at least) on Android. We may need to migrate the Title to RichText if there is no way to circumnavigate this problem.

Note 2: At the moment there is not split in place for the title filed. If you tap enter on the middle of the field there is no split yet.

Previous PR here: #13480

[diegoreymendez]

This is working fine, but I believe it would be to our advantage to try and use more of the web code where possible.

As mentioned in the comment I tested copying some of the web code, and it works great.

[diegoreymendez]

This is working fine, but I believe it would be to our advantage to try and use more of the web code where possible.

As mentioned in the comment I tested copying some of the web code, and it works great.

[diegoreymendez]

We could remove this method entirely and instead copy (and call) this method from the web .js sources.

I've tried it locally and it works and it works.

The advantage of using the same code as the web .js file is that it should make it easier for us to maintain this sourcefile if there are changes, or eventually unify it completely.

[diegoreymendez]

For the comment above to work, this would become onSubmitEditing={ this.props.onEnterPress }

[daniloercoli]

Nice find @diegoreymendez!

Tested here as well, and worked without problems 👍 I've updated this PR and main PR gb-mobile side.

[diegoreymendez]

Nice work @daniloercoli !