I just migrated from Arch Linux to NixOS. I configured the system to install GNOME. I'm used to install desktop applications using Flatpak, so I went ahead and configured everything...just to realize almost all Flatpak applications are borked and are unable to display the correct theme, fonts, and icons. This is a major issue (at least for me) because sometimes it's impossible to know where the cursor is located at in the screen, the usual interface (not application-specific) icons are changed for the most part, so they don't change accordingly — for instance, when trying to resize windows the cursor doesn't change to give you the proper hint.
I researched the subject and looks like there are issues reported for this, but I wonder if someone has found a solution — hopefully that doesn't involve modifying too much the system.
I did install the fonts in the recommended way, but nothing changed:
{ config, pkgs, ... }: { imports = [ ./hardware-configuration.nix ]; ... fonts = { enableDefaultFonts = true; fontDir.enable = true; fontconfig = { antialias = true; cache32Bit = true; hinting.autohint = true; hinting.enable = true; }; fonts = with pkgs; [ noto-fonts noto-fonts-cjk noto-fonts-emoji # noto-fonts-extra # Was present in Arch Linux :/ ubuntu_font_family ]; }; ... }