KDE Gear 21.04.0

[ttuegel]

Motivation for this change

• Update KDE Applications 20.12.3 to KDE Gear 21.04.0.
• Change the attribute name from kdeApplications to kdeGear.

Attn: @NixOS/qt-kde

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[SuperSandro2000]

I think we should add an alias from kdeApplications to kdeGear.

[FRidh]

@GrahamcOfBorg eval

[schmittlauch]

I'd be willing to test some of this, but am not sure whether this is possible from a 20.09 installation. Mixing Qt versions running in parallel is still problematic, isn't it?

[ttuegel]

@SuperSandro2000 Is there a way to add a nested alias to alias.nix, or do we need to add an alias directly to qt-packages.nix?

[SuperSandro2000]

@SuperSandro2000 Is there a way to add a nested alias to alias.nix, or do we need to add an alias directly to qt-packages.nix?

Not fully sure. Some examples are here https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/aliases.nix#L751 and here https://github.com/NixOS/nixpkgs/blob/master/pkgs/top-level/aliases.nix#L944

Also I think you missed https://github.com/NixOS/nixpkgs/blob/21.05/pkgs/top-level/all-packages.nix#L17598