nixos/tests/keymap: disable xterm DM

[srhb]

Motivation for this change

Another go at alleviating the flaky keymap tests.

Things done

The xterm display manager has been disabled. The test spins up its own xterm, but sometimes the DM xterm would be in focus instead, causing failures..

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• 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 nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

---

[srhb]

@GrahamcOfBorg test keymap.colemak

[GrahamcOfBorg]

Failure for system: x86_64-linux

fetching path ‘/nix/store/njm35d3d0aanw1fi6khhmxsh9mhnfq7x-btrfs-progs-4.14.1’...

*** Downloading ‘https://cache.nixos.community/nar/1flpv3rryrivnpqvhxm394ma4pf111y8d6z7j32arrrm049flm2l.nar.xz’ (signed by ‘cache.nixos.org-1’) to ‘/nix/store/njm35d3d0aanw1fi6khhmxsh9mhnfq7x-btrfs-progs-4.14.1’...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100   117  100   117    0     0    117      0  0:00:01 --:--:--  0:00:01  2785

100  629k  100  629k    0     0   629k      0  0:00:01 --:--:--  0:00:01  629k

building path(s) ‘/nix/store/0fvpn2305hwbz9gzk3zc805l0s43imgd-Xresources-Xft’
error: a ‘aarch64-linux’ is required to build ‘/nix/store/50jzcfx3gpm7bn6hx4k448x9gjdb74p0-Xresources-Xft.drv’, but I am a ‘x86_64-linux’

[Mic92]

Thanks!

[vcunat]

Hmm, 2/6 keymap tests failed on Hydra :-(

[srhb]

@vcunat I noticed. :/ I'm not quite sure what's causing it, but I am considering reviving #33719 with a delay before the initial focus attempt in order to remedy it. It would be grand if someone has a better idea at debugging this, however, since I'm just piling workaround upon workaround...

[globin]

ping @aszlig

[Mic92]

The test is pretty complex, is there a way to simplify the code?