Live-update the site title in the admin bar when changing the corresponding setting field

[celloexpressions]

Similarly to how #23076 works, for the Settings -> General screen.

[celloexpressions]

Worth noting that this now happens in the Customizer, where the site title is displayed under "You are customizing".

[celloexpressions]

Should be ready for commit unless anyone has other considerations to bring up. We're doing similar things in the Customizer and in Menus now too.

[iseulde]

Should probably cache the queries a bit (you can use this). Refreshed the patch.

[SergeyBiryukov]

In 29963:

Live-update site title in toolbar when changing the corresponding field in General Settings.

props celloexpressions, avryl.
fixes #28682.

[nacin]

I just saw this in the wild without knowing about this ticket. I love little details like this. This is really awesome. :-)

• When your blogname is empty, we show your URL, with protocol and up through www trimmed off. Should we do that here? I deleted my blogname to type it again, and the toolbar was looking sparse.

• It doesn't handle "My Sites". Does that matter? Is there any reason why it couldn't? (Currently, an empty blogname means we spit out $blog->domain in PHP, which doesn't necessarily makes sense, and we should use the same technique as in the first bullet point, but that should be fixed separately.)

[johnbillion]

I think this is a completely pointless change, but meh, whatever.

Should the <title> change at the same time?

[nacin]

Replying to johnbillion:

I think this is a completely pointless change, but meh, whatever.

One thing that helps separate WordPress from the rest of the pack is the little design details like this. This comes directly from matt's approach to building software, and it's something that markjaquith, helen, koop, and I have pushed especially hard for with every feature we've worked on. It's also really cool that none of us were involved here. These values are instilled deep!

As I said above, I didn't know about this ticket until I randomly saw it in action a week or two after it was committed. But I didn't share what my reaction was — "WHOA! Cool!" As it should be.

For more cool stuff along these lines, see ​http://littlebigdetails.com/. (Incidentally, the latest post on that blog is ​http://littlebigdetails.com/post/103042529164/automattic-the-jobs-page-detects-if-youve.)

[nofearinc]

That enhancement is just awesome and 28682.2.patch works for me.

[SergeyBiryukov]

In 30597:

When live-updating site title in toolbar, fall back to the site url if the title is empty.

props avryl.
see #28682.

[SergeyBiryukov]

In 30598:

Consistently handle an empty site title in Site and My Sites toolbar menus.

see #28682.

[SergeyBiryukov]

[30598] addresses the $blog->domain issue outlined in comment:7.

I think we can skip live-updating "My Sites" or <title>, and close this as fixed for now.