Xft dpi font scaling

Hi there, since years I use xemacs-beta, currently 21.5.34: https://t2sde.org/packages/xemacs-beta Except the lack of updates I am quite happy with that setup, however one details drives me increasingly crazy. Namely HiDPI font scaling when I switch between old displays and newer, 4k+ HiDPI, 192++ dpi screens. I have this font selection in my .xemacs/init.el (set-face-font 'default "Source Code Pro-13") ; or -22 for HiDPI Ideally I want this -13 to be pt, so that I do not have to edit the file each time I switch my desk or continue coding on the road. Googling around suggest others alternative forms which either do not work in xemacs-beta, or do not prove the situation. I tried to read the lisp files, but could not find anything that would help me there either. Is there anything "pt" like so that a 13pt would result in say 13 pixels on a low resolution display, and 26 (or whatever) pixels on a HiDPI screen with the X server dpi set accordingly? PS: Surprisingly the Xemacs menus and such sale automatically, just not this most important, main edit buffer, ..? Best regards – and greetings from Europe, René -- René Rebe, ExactCODE GmbH, Lietzenburger Str. 42, DE-10117 Berlin http://exactcode.com | http://t2-project.org | http://rene.rebe.de