em size and how it works is not related to GTK but a standard usage on screen rendering. So all apps, system should use this standard thing. It's noted for example on CSS standard W3C page : https://www.w3.org/Style/Examples/007/units.en.html

Anyway, it seems as Aurelien precise it, that some systems/configuration applied a default dpi not too standard that change that. So quite difficult to find that if any people who develop darktable have these specific systems. So, in other dpi standard screen (if I remember well, default dpi is 72dpi), the 1em=1.333px is no more avalaible, making the font size acting differently...


Le 05/11/2019 à 20:54, Timur Irikovich Davletshin a écrit :
On Tue, 2019-11-05 at 20:47 +0100, Aurélien Pierre wrote:
Setting font size to 1em should tell GTK to use the default OS font
size, no matter its value.
Size doesn't match default OS settings (Debian 10 default installation)
on 3 displays I tried (2 low-dpi, 1 high-dpi). Do you have link on GTK
documentation which says that 1em equals default size? I'd be glad to
know logic behind it.

Thank you in advance,

Timur.

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