[AUCTeX] Preview width and font size, again

[Evgeny Makarov]

Hello,

I found a couple of discussions of font size and preview width on this 
list, and the advice to customize preview-scale-function to increase 
font size worked for me. I just want to give my rationale for this. The 
default font size in previews is indeed equal to the Emacs font size; 
however, x-heights may be different. For example, I use the buffer font 
called simply "monospace" in Ubuntu at size 12. (preview-document-pt) 
returns 10, and the default scale is 1.21. I include the screenshots of 
a word in preview and in the document (at 100% and 500%); the x-height 
of the word in preview is noticeably smaller, which gives an appearance 
of a smaller font. Also, the buffer font seems bolder, and smoothing and 
hinting make it seem clearer, which may contribute to the perceived 
difference in sizes.

One other thing: section 6.2 of the Preview Manual says that 
preview-scale-function can be customized in the preview-latex group, but 
it is located in preview-appearance group.

Concerning the width, I am editing a draft document, where I don't want 
to bother about overfulls yet. Again, the preview is reasonably cut 
where the right margin begins on paper; however, for now I want it to 
be, say, 1.5 times wider so that I can see the whole formula.

So, could you say how to increase the preview width?

Thank you,
Evgeny