Fonts render wrong on GTK+3

[nullchinchilla]

On GTK+3, controls render correctly if I leave the fonts at their default, but the fonts become far too small if I set any custom font. The ratio of the shrinking seems to be the ratio of a pt to a px. This even happens if I manually set normal-control-font as the font. My screen and display setup is not Retina or otherwise strange.

On GTK+2 and Windows the fonts render normally.

Here's a trivial example that shows what I mean:

#lang racket/gui

;; expected: two "hello world" of the same size
;; actual: on GTK+3, the second one is far smaller.
;;         on other platforms, behaves as expected.

;; in fact any text seems to render far smaller
;; in GTK+3, except when I don't specify any font.

;; my system is GNOME 3 on Debian. My screen has
;; a conventional density and isn't Retina or anything.

(define main-frame
  (new frame%
       [label "demo"]
       [stretchable-width #f]
       [stretchable-height #f]))

(define msg-1
  (new message%
       [parent main-frame]
       [label "hello world"]))

(define msg-2
  (new message%
       [parent main-frame]
       [label "hello world"]
       [font normal-control-font]))

(send main-frame show #t)

[mflatt]

Thanks for the report! I've been trying various distributions that I have conveniently available, and none of them have failed in this way, so I think it's a matter of trying the right distirbution and/or configuration. Can you tell me more about your OS and GTK+ 3 installation/version?

[nullchinchilla]

I am on the latest Debian Unstable with the default gnome installation and the racket package from the Debian repos. GTK+3 version is 3.22. I don't think there's anything weird with my setup, and the behavior has been stable through many system updates for a long time.

[mflatt]

I think I've tracked the problem down to a repair in GTK+3 3.22 that breaks a workaround in racket/gui, and I've pushed an intended repair to racket/gui as racket/gui@5e70534

[mflatt]

I think this is fixed in v6.8.