Don't set custon fontconfig

[DhruvaSambrani]

It seems that setting a different fontconfig prevents using emoji fonts in GTK Entry, among other issues
GTK.jl should not override system fontconfig

[giordano]

Do you mean the FONTCONFIG_FILE and FONTCONFIG_PATH environment variables? They are set in https://github.com/JuliaBinaryWrappers/Fontconfig_jll.jl/blob/4a774dc6b40531890eb0cc37b09976802ac1bbf1/src/wrappers/x86_64-linux-gnu.jl#L80-L81 and they do not override system defaults if those variables are already set.

[DhruvaSambrani]

Oh, right.

However, hitting ctrl+. in an Entry widget shows the emoji popup, but no emojis are actually rendered. Other gtk apps work, so its not a system wide issue. The UI was made with glade, and running glade-previewer with the glade file works fine too. So the only layer which could be causing the issue is GTK.jl

[giordano]

I mean, you need to set FONTCONFIG_FILE to the desired value to ensure your system fontconfig is used. What Fontconfig_jll does it to provide a default in case there are no other options.