> I kind of think that the feature the last change added is more valuable
> than the regression (especially if the regression is only triggered when
> a commit message is expanded).

It is triggered not only when a commit message is expanded.
Also it is triggered on single-file logs.  Admittedly, my previous patch
didn't take this into account.  Here is a new patch that works also
for single-file logs.  It relies on the function 'log-view-end-of-defun'
that takes care about the "Show 2X entries" footer: