Hello.
I have set font size to 10 (at Widget Style of GNOME/GTK Applications). The same size (10) is at qt-applications.
~/.config/gtk-3.0/settings.ini

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[Settings]
gtk-font-name=Noto Sans Regular 10
gtk-theme-name=Breeze
gtk-icon-theme-name=breeze
gtk-fallback-icon-theme=Adwaita
gtk-cursor-theme-name=breeze_cursors
gtk-toolbar-style=GTK_TOOLBAR_ICONS
gtk-menu-images=1
gtk-button-images=1
gtk-primary-button-warps-slider=0
gtk-cursor-blink = 0


~/.gtkrc-2.0

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# File created by KDE Gtk Config
# Configs for GTK2 programs

include "/usr/share/themes/Breeze/gtk-2.0/gtkrc"
style "user-font"
{
   font_name="Noto Sans Regular"
}
widget_class "*" style "user-font"
gtk-font-name="Noto Sans Regular 10"
gtk-theme-name="Breeze"
gtk-icon-theme-name="breeze"
gtk-fallback-icon-theme="Adwaita"
gtk-cursor-theme-name="breeze_cursors"
gtk-toolbar-style=GTK_TOOLBAR_ICONS
gtk-menu-images=1
gtk-button-images=1
gtk-primary-button-warps-slider=0
gtk-cursor-blink = 0


But the size of menu font is different in GIMP (GTK2 only) and Virtual-Manager (GTK3 only). It seems to be 4 points difference.

Why it is so?

* Gentoo linux
* KDE Frameworks 5.34.0
* Qt 5.7.1 (built against 5.7.1)
* The xcb windowing system

Found out - dpi.
I have /etc/X11/xorg.conf.d/10monitor.conf

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Section "Monitor"
    Identifier     "LVDS-1"
    DisplaySize   381   214
EndSection

So, dpi is 128, but GTK3 ignores that (it calculates size from 96). Why?

Workaround.
~/.bash_profile

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export GDK_DPI_SCALE=1.33

sspphheerraa wrote:So, dpi is 128, but GTK3 ignores that (it calculates size from 96). Why?

See https://bugzilla.gnome.org/show_bug.cgi?id=757142

Thanks. Now I see.
https://bugzilla.gnome.org/show_bug.cgi?id=757142
https://bugs.freedesktop.org/show_bug.cgi?id=98909
https://bugzilla.mozilla.org/show_bug.cgi?id=1269274
All are "WONTFIX". Bad situation