Description of Problem:
The fonts used in the preview, edit and print (/ print preview) is
different.  Making font size larger does not result in larger fonts.

Steps to reproduce the problem:
1. Create a draft mail item
2. Set fonts to Sans 8 / Monospace 8
3. Open print preview, compose and preview (main evolution) window of draft
item.
4. Change to Sans 10 / Monpsace 8 (open print preview)
5. Change to Sans 8 / Monospace 10 (open print preview)
6. Change to Sans 10 / Monospace 10 (open print preview)

Actual Results:
Font sizes varies depending on combination and window. (Print preview stays
the same size).  Font size becomes smaller when making some fonts larger.

Expected Results:
When making a font larger one expects the resulting fonts in all windows to
be larger. 

How often does this happen? 
Always

Additional Information:
The Print preview window does not seem to follow the font size behavior. 
This is different in the INBOX folder.  Will log another bug accordingly.

Have also tested it for other font size combinations.