bug#40759: 26.3; Update Leuven-theme in Emacs dev trunk

[Fab Rice]

Dear Emacs maintainers,

I'm the author of Leuven color theme, currently in Emacs since 24.4.

But the version has not been updated for a while, while I've improved it
with time.

Could you update its code with the following patch?

(I've generated it with 'git format-patch', so that you could apply it
with 'git am'.)

Thanks in advance!

Best regards,
Fabrice Niessen

0001-Update-leuven-theme.el.patch
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