bug#18847: 24.4; Inconsistent behaviour of M-h with negative arguments

[Lars Ingebrigtsen]

dieter@duenenhof-wilhelm.de (H. Dieter Wilhelm) writes:

> The following patches
>
> 1) solve bug#18847 (when applying M-h with negative arguments and
>    repeating this command)
>
> 2) solve another - not reported - bug.  When, e.g. at the end of the
>    buffer, the numbers of paragraphs left in the buffer is less than
>    ARG, then paragraphs are also marked *before* the current paragraph
>    (contradicting the function's documentation)
>
> 3) (hopefully) clarifying a bit the documentation of mark-paragraph
>
> 4) aligning the behaviour of a zero argument to other marking commands
>    (doing nothing, no error signal)

Thanks; I've now applied this patch to Emacs 28 (with some small
whitespace changes).

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