bug#51590: follow-mode is broken with header-line and tab-line

[Juri Linkov]

>> Now enable 'M-x global-tab-line-mode' and observe that
>> the same line is still visible at the top of the right window,
>> whereas the bottom line of the left window shows another
>> partially-visible line.  This is a bug.
>
> Could this be related to Bug#47498?

Indeed, this is the same problem fixed by the same proposed patch.