recenter-top-bottom should run after Spacemacs package updates to make Spacemacs home buffer display correctly

[bryce-carson]

I haven't updated my spacemacs clone or packages in a long time (though I use it every day!). With these updated, I remembered an issue that occurs.

When you update your packages the home buffer will be printed on and then it will be cleared and remade and all sorts of goings on. In the end, the bottom of the buffer is displayed at the top of the screen and the buffer appears empty (but isn't).

This can be fixed with one or two calls to recenter-top-bottom or moving point to the beginning of the buffer (more appropriately) at the end of a package update.

[bryce-carson]

Further, I once had a commit in some ephemeral branch that gutted the code related to the displayed message in the echo area. I won't bother exhuming it, but I can write it again and open a PR for that. I don't know if I'll get to it, but I'm not too busy these days so I might.