[PR PATCH] gdm: enable smooth transition with plymouth.

[circhioz <circhioz@users.noreply.github.com>]

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There is a new pull request by circhioz against master on the void-packages repository

https://github.com/circhioz/void-packages gdm-plymouth
https://github.com/void-linux/void-packages/pull/28570

gdm: enable smooth transition with plymouth.
Support for smooth transition was disabled years ago, when `plymouth` wasn't in the Void repo. `gdm` checks whether `plymouth` can be pinged at run time so that no hard dependency is required.

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#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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A patch file from https://github.com/void-linux/void-packages/pull/28570.patch is attached

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From 7449bb240a14df0e0a11ba12b6dda1d3e5b14533 Mon Sep 17 00:00:00 2001
From: Francesco Circhetta <francesco.circhetta@gmail.com>
Date: Sun, 7 Feb 2021 18:40:54 +0100
Subject: [PATCH] gdm: enable smooth transition with plymouth.

---
 srcpkgs/gdm/template | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/srcpkgs/gdm/template b/srcpkgs/gdm/template
index 6ef190e057c..e5b84645b4c 100644
--- a/srcpkgs/gdm/template
+++ b/srcpkgs/gdm/template
@@ -1,19 +1,20 @@
 # Template file for 'gdm'
 pkgname=gdm
 version=3.38.2.1
-revision=2
+revision=3
 build_helper="gir"
 build_style=meson
 configure_args="
  -Ddefault-pam-config=arch -Dat-spi-registryd-dir=/usr/libexec
  -Dtcp-wrappers=false -Dscreenshot-dir=/var/lib/gdm/greeter
- -Dplymouth=disabled -Dxauth-dir=/run/gdm -Dpid-file=/run/gdm/gdm.pid
+ -Dplymouth=enabled -Dxauth-dir=/run/gdm -Dpid-file=/run/gdm/gdm.pid
  -Dsystemd-journal=false -Dinitial-vt=7 -Dwayland-support=true
  -Dselinux=disabled -Dlibaudit=disabled
  -Dsystemdsystemunitdir=/tmp -Dsystemduserunitdir=/tmp"
 hostmakedepends="dconf gettext itstool pkg-config"
 makedepends="accountsservice-devel elogind-devel gettext-devel glib-devel
- iso-codes libSM-devel libcanberra-devel nss-devel pam-devel upower-devel"
+ iso-codes libSM-devel libcanberra-devel nss-devel pam-devel upower-devel
+ plymouth-devel"
 depends="gnome-settings-daemon gnome-shell gnome-session gnome-themes-extra
  gsettings-desktop-schemas xorg-server xorg-server-xwayland xrdb"
 checkdepends="check-devel"