Focus on title when creating a new post.

[diegoreymendez]

Description:

Resolves wordpress-mobile/WordPress-iOS#10594

This PR focuses the title when opening Gutenberg, if the post has no title and no content. This is a simplified and initial approach, that seems to be enough to match the condition that we're dealing with a new post.

If we find this condition isn't enough we can expand incrementally.

Related PRs:

Gutenberg: WordPress/gutenberg#13874

Testing:

Test 1:

1. Run the demo app.

Make sure the focus is NOT in the title, since it's not empty and there are blocks.

Test 2:

1. Edit App.js, and force initialTitle = ''; and initialData = '';.
2. Run the demo app.
3. Make sure the title and content are empty. If not, go back to step 1.

Make sur the focus is in the title, since the title is empty and there are no blocks.

[daniloercoli]

I've left just a couple of comments, but this PR is LGTM once those and GB conflicts are resolved!

Did you test this PR by integrating it into the main wp-ios or wp-android apps?

As discussed in Slack convo, we may want to iterate on this, and read the isNewPost parameter from the parent app (via the bridge/glue code) instead of manually checking it with this.props.title === '' && this.props.blockCount === 0

[diegoreymendez]

As discussed in Slack convo, we may want to iterate on this, and read the isNewPost parameter from the parent app (via the bridge/glue code) instead of manually checking it with this.props.title === '' && this.props.blockCount === 0

No, but I purposely left that out of the scope of this PR. As soon as we close this I'll submit a PR to test the integration and make any necessary changes (which I expect will be none).

In my modest opinion, it's in our best interest to try and work with more and more incrementally, unless there's a good reason to hold everything back.

This ensures we don't spend a lot of time synching both open PRs due to very small pending changes / fixes.

We've seen some of this in the past and I'd like to avoid spending time to maintain a lot of open PRs unless it's really necessary to avoid breakage (in this case, the result won't be worse than it was before).

[diegoreymendez]

Comments adressed @daniloercoli .

[daniloercoli]

LGTM once gutenberg ref is updated.