Fixes needed for Gnome Display Manager (GDM)?

While trying to sort out one of my longstanding irritations, I noticed the following comments present in /etc/gdm/Init/Default:

SETXKBMAP=`gdmwhich setxkbmap`
if [ "x$SETXKBMAP" != "x" ] ; then
  # FIXME: is this all right?  Is this completely on crack?
  # What this does is move the xkb configuration from the GDM_PARENT_DISPLAY
  # FIXME: This should be done in code.  Or there must be an easier way ...
  if [ -n "$GDM_PARENT_DISPLAY" ]; then
    if [ -n "$XKBSETUP" ]; then
      XKBKEYMAP=`echo "$XKBSETUP" | grep '^keymap' | awk '{ print $2 }'`
      XKBTYPES=`echo "$XKBSETUP" | grep '^types' | awk '{ print $2 }'`
      XKBCOMPAT=`echo "$XKBSETUP" | grep '^compat' | awk '{ print $2 }'`
      XKBSYMBOLS=`echo "$XKBSETUP" | grep '^symbols' | awk '{ print $2 }'`
      XKBGEOMETRY=`echo "$XKBSETUP" | grep '^geometry' | awk '{ print $2 }'`
      if [ -n "$XKBKEYMAP" ]; then
        $SETXKBMAP -keymap "$XKBKEYMAP"
      elif [ -n "$XKBTYPES" -a -n "$XKBCOMPAT" -a -n "$XKBSYMBOLS" -a -n "$XKBGEOMETRY" ]; then
        $SETXKBMAP -types "$XKBTYPES" -compat "$XKBCOMPAT" -symbols "$XKBSYMBOLS" -geometry "$XKBGEOMETRY"
      elif [ -n "$XKBTYPES" -a -n "$XKBCOMPAT" -a -n "$XKBSYMBOLS" ]; then
        $SETXKBMAP -types "$XKBTYPES" -compat "$XKBCOMPAT" -symbols "$XKBSYMBOLS"
      elif [ -n "$XKBSYMBOLS" ]; then
        $SETXKBMAP -symbols "$XKBSYMBOLS"

Is there still something that needs to be addressed here?

From where come this ? You have installed gdm or others packages out of our repository ?

Just a standard Manjaro Gnome installation made about 2 years ago. My output of pacman -Qs gdm is this:

local/gdm 3.36.3-7 (gnome)
    Display manager and login screen
local/libgdm 3.36.3-7
    GDM support library
local/manjaro-gdm-branding 20200803-1
    Manjaro GDM branding
local/manjaro-gdm-theme 20200708-1
    Manjaro GDM theme
local/manjaro-gdm-tweak 20190711-1
    Manjaro gdm tweak to kill the double shell

My inxi -Fazy output is below:

  Kernel: 5.8.16-2-MANJARO x86_64 bits: 64 compiler: N/A 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.8-x86_64 
  root=UUID=f5245ffc-4c91-4b47-b905-1d35123f8237 rw quiet apparmor=1 
  security=apparmor udev.log_priority=3 mitigations=off 
  Desktop: GNOME 3.36.6 tk: GTK 3.24.23 wm: gnome-shell dm: GDM 3.36.3 
  Distro: Manjaro Linux 
  Type: Desktop System: Intel Client Systems product: NUC8i7HVK v: J71485-504 
  serial: <filter> Chassis: Intel Corporation type: 3 v: 2.0 serial: <filter> 
  Mobo: Intel model: NUC8i7HVB v: J68196-504 serial: <filter> UEFI: Intel 
  v: HNKBLi70.86A.0059.2019.1112.1124 date: 11/12/2019 

  Topology: Quad Core model: Intel Core i7-8809G bits: 64 type: MT MCP 
  arch: Kaby Lake family: 6 model-id: 9E (158) stepping: 9 microcode: D6 
  L2 cache: 8192 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 49618 
  Speed: 800 MHz min/max: 800/8300 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 
  4: 800 5: 801 6: 800 7: 800 8: 800 
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled 
  Type: l1tf mitigation: PTE Inversion; VMX: vulnerable 
  Type: mds status: Vulnerable; SMT vulnerable 
  Type: meltdown status: Vulnerable 
  Type: spec_store_bypass status: Vulnerable 
  Type: spectre_v1 status: Vulnerable: __user pointer sanitization and 
  usercopy barriers only; no swapgs barriers 
  Type: spectre_v2 status: Vulnerable, IBPB: disabled, STIBP: disabled 
  Type: srbds status: Vulnerable 
  Type: tsx_async_abort status: Not affected 
  Device-1: Intel HD Graphics 630 driver: i915 v: kernel bus ID: 00:02.0 
  chip ID: 8086:591b 
  Device-2: AMD Polaris 22 XT [Radeon RX Vega M GH] vendor: Intel 
  driver: amdgpu v: kernel bus ID: 01:00.0 chip ID: 1002:694c 
  Display: x11 server: X.Org 1.20.9 compositor: gnome-shell 
  driver: amdgpu,ati,intel unloaded: modesetting,radeon alternate: fbdev,vesa 
  display ID: :0 screens: 1 
  Screen-1: 0 s-res: 3840x1080 s-dpi: 96 s-size: 1016x285mm (40.0x11.2") 
  s-diag: 1055mm (41.5") 
  Monitor-1: DisplayPort-2 res: 1920x1080 hz: 60 dpi: 93 
  size: 527x296mm (20.7x11.7") diag: 604mm (23.8") 
  Monitor-2: DisplayPort-3 res: 1920x1080 hz: 60 dpi: 93 
  size: 527x296mm (20.7x11.7") diag: 604mm (23.8") 
  OpenGL: renderer: AMD VEGAM (DRM 3.38.0 5.8.16-2-MANJARO LLVM 10.0.1) 
  v: 4.6 Mesa 20.1.8 direct render: Yes 
  Device-1: Intel CM238 HD Audio driver: snd_hda_intel v: kernel 
  bus ID: 00:1f.3 chip ID: 8086:a171 
  Device-2: AMD Polaris 22 HDMI Audio vendor: Intel driver: snd_hda_intel 
  v: kernel bus ID: 01:00.1 chip ID: 1002:ab08 
  Device-3: Logitech Logitech StreamCam type: USB 
  driver: hid-generic,snd-usb-audio,usbhid,uvcvideo bus ID: 6-1:2 
  chip ID: 046d:0893 serial: <filter> 
  Sound Server: ALSA v: k5.8.16-2-MANJARO 
  Device-1: Intel Ethernet I219-LM driver: e1000e v: 3.2.6-k port: f040 
  bus ID: 00:1f.6 chip ID: 8086:15b7 
  IF: eno1 state: up speed: 100 Mbps duplex: full mac: <filter> 
  Device-2: Intel I210 Gigabit Network driver: igb v: 5.6.0-k port: b000 
  bus ID: 05:00.0 chip ID: 8086:157b 
  IF: enp5s0 state: down mac: <filter> 
  Device-3: Intel Wireless 8265 / 8275 driver: iwlwifi v: kernel port: b000 
  bus ID: 06:00.0 chip ID: 8086:24fd 
  IF: wlp6s0 state: down mac: <filter> 
  Local Storage: total: 953.87 GiB used: 541.21 GiB (56.7%) 
  SMART Message: Required tool smartctl not installed. Check --recommends 
  ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 970 PRO 1TB size: 953.87 GiB 
  block size: physical: 512 B logical: 512 B speed: 31.6 Gb/s lanes: 4 
  serial: <filter> rev: 1B2QEXP7 scheme: GPT 
  ID-2: /dev/nvme1n1 vendor: A-Data model: SX8200PNP size: 953.87 GiB 
  block size: physical: 512 B logical: 512 B speed: 31.6 Gb/s lanes: 4 
  serial: <filter> rev: SS0411B scheme: GPT 
  ID-1: / raw size: 953.57 GiB size: 937.61 GiB (98.33%) 
  used: 292.91 GiB (31.2%) fs: ext4 dev: /dev/nvme0n1p2 
  Kernel: swappiness: 60 (default) cache pressure: 100 (default) 
  ID-1: swap-1 type: file size: 32.00 GiB used: 0 KiB (0.0%) priority: -2 
  file: /swapfile 
  System Temperatures: cpu: 63.5 C mobo: 29.8 C gpu: amdgpu temp: 52 C 
  Fan Speeds (RPM): N/A 
  Processes: 288 Uptime: 2h 38m Memory: 31.28 GiB used: 4.83 GiB (15.5%) 
  Init: systemd v: 246 Compilers: gcc: 10.2.0 alt: 8 Packages: pacman: 1760 
  lib: 421 Shell: Zsh v: 5.8 running in: gnome-terminal inxi: 3.1.05 

This come from upstream … i can see this also in arch package…

Fair enough. Their issue then I guess.

Here you go

ask at gnome dev is better