bug#60157: 30.0.50; [PATCH]: Change interactive form in transpose-chars

[Theodor Thornhill]

Hi Stefan and Eli!

As a part of my investigation into transposing things using tree-sitter
I promised to also introduce some improvements to both the code and
documentation, as the latter is a little sparse.  I'll add some patches
while I work on the tree-sitter stuff.

This commit simplifies the transpose-chars.  The bug described in the
commit history is no longer reproducible, so I think its complicated
nature can be removed.  What do you think?

Theo

0001-Use-p-in-interactive-form-in-transpose-chars.patch
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