bug#65591: 30.0.50; ELPA pgk expreg: marking paragraph doesn't work in AUCTeX LaTeX-mode

[Tassilo Horn]

When using `expreg-expand' repeatedly in an AUCTeX LaTeX-mode buffer, it
will never mark the complete paragraph.  The reason is that
`expreg--paragraph' tries to distinguish between programming and
text/prose modes where in the former, it wants to mark the defun whereas
in the latter, it marks the paragraph.

AUCTeX LaTeX-mode (and (La)TeX as a language) is kind of a middle ground
between prog-mode and text-mode.  It is derived from text-mode (and NOT
prog-mode) but it defines a `beginning-of-defun-function' which deals
with environments, e.g., \begin{foo}...\end{foo}.  It can make sense to
mark both, the current environment as well as the current paragraph.
However, currently expreg defines a programming mode to derive from
prog-mode OR define a `beginning-of-defun-function' and for a
programming mode, paragraph marking is disabled.

I guess it would be better to have separate `expreg--paragraph' and
`expreg--defun' functions instead of conflating paragraph and defun
marking in `expreg--paragraph'.


In GNU Emacs 30.0.50 (build 17, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.17.8) of 2023-08-29 built on thinkpad-t440p
Repository revision: 804a96af28235b8a1a1199fc9c2e96e367ce14f6
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --with-tree-sitter --with-pgtk --with-modules'

Configured features:
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Important settings:
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