bug#28182: maybe implement CTRL++ to zoom text

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

> > I've attached a tentative patch along those lines.  WDYT?
>
> Any reason to make the new behavior be the default, i.e. break
> backward compatibility?  Why not make this an opt-in feature instead?

I think it's a better default, since it's more in line with user
expectations.  The "Ctrl+mouse whell changes font size" behaviour is
pretty ubiquitous in browsers, text editors and IDEs.  From the top of
my head, you can change the font size (sometimes called "zoom") using
this shortcut in Firefox, Chrome, Safari, Eclipse, LibreOffice, Adobe
Reader, evince, and many, many others.  From searching the web, this
seems to be the default also in Atom, Sublime Text, TextMate,
Notepad++ and IntelliJ.  VSCode stands out by making this optional.

We could of course make it an opt-in feature should we want to do that.

> > I'm not sure exactly how to reformulate the doc string for
> > mouse-wheel-scroll-amount to fit the new behaviour.  I'll have to
> > think about it a bit more.  Do let me know if you have any ideas.
>
> I'm not sure we need to change the doc string, but we definitely need
> to change the :version tag.

Fixed that in the attached patch.

Best regards,
Stefan Kangas

0001-Support-changing-font-size-using-mouse-wheel.patch
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