KMail HTML viewer: font size

[Erik Quaeghebeur]

> is there a way to change the font size in KMail's HTML viewer? I have a 
> MacBookPro 12,1 13" (Early 2015) with retina display (HiDPI), and the rendered 
> HTML messages appear way too small to be read. 
> 
> Lastly, but this is a minor drawback, is it possible to enlarge the font used 
> for the subject line? By default it is smaller than the font used for the 
> From, To, and Date fields, and it appears weird.

The latter issue can certainly be dealt with by creating a custom header theme using the Grantlee functionality and perhaps also the former, given that with the Grantlee theme can have an impact beyond the header.

To learn about Grantlee themeing, I suggest googling for "grantlee kmail" and similar queries.
There is a GUI, but I only got some success in creating my own theme (nothing related to HiDPI) by creating it manually. Documentation is scarce… and there are some issues, for example https://bugs.kde.org/show_bug.cgi?id=364176 and that external CSS (so not in the HTML file itself) do not seem to work.

For me, the themes are in

	$HOME/.kde4/share/apps/messageviewer/themes/

each in their own directory.

I've put a theme I've made in attachment. You can see that with the CSS you can have control over both the header (which you can wholly design using the theme HTML-like language) and the body (whose HTML you cannot control).


Success,

Erik
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