Tabulated list recenter issue

[Ian Dunn]

When sorting a tabulated list, tabulated-list-mode will move the window to keep 
the current entry at the same line in the window.

If a user has their cursor on the top entry with sort active, then reverses the 
sort, the other entries seemingly disappear.

You can see this in the package menu if you've got a small archive (I've been 
using the org archive) or have only a few new packages.  Sort the package list 
by status (for few new packages) or archive (for a small archive), then reverse 
the sort.

This isn't a big problem for something like the package menu where there are 
enough entries to fill a few screens, but I'm using tabulated-list-mode for 
ENWC, and I don't think I've ever filled a screen with access points.

The code causing the behavior in question is in tabulated-list-print, at lines 
400 and 401:

> (when window-line
>   (recenter window-line))

window-line is set at lines 343 and 344:

> (setq window-line
>   (count-screen-lines (window-start) (point)))

My proposed solution is this:

  If moving the window to keep the current entry at the same line would leave 
blank space at the end of the window, don't move the window, but keep point on 
the current entry.

Does anyone else have any thoughts on this?

-- 
Ian Dunn