displaying message - loading

[tomholub]

When I click on a message and it's loading, the whole screen will be white while it's loading the info.

However, before I clicked on the message, we already knew the basics (from, to, subject). We should render the basic info we know from message headers immediately after clicking on a message, and only show a spinner on the part of the screen where the message body should be.

Once the body loads, the spinner will get replaced. But while it's loading, I should already be able to see the message headers info on top.

If it's not possible to reply until the body is loaded, you can hide the reply button until the body loads.

[tomholub]

I like this a lot!