[gnome-shell-sass] welcomeDialog: Add “welcome” dialog

[Florian Müllner <fmuellner src gnome org>]

commit be71f0bbc1534ed83798d0f2f3e1e2d7f991c2b9
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Feb 1 10:20:48 2021 +0100

    welcomeDialog: Add “welcome” dialog
    
    As designed at:
    https://gitlab.gnome.org/Teams/Design/os-mockups/-/blob/master/greeter/welcome-dialog.png
    
    Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3632
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1619>

 widgets/_dialogs.scss | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/widgets/_dialogs.scss b/widgets/_dialogs.scss
index 0f568b7..6eb1cc1 100644
--- a/widgets/_dialogs.scss
+++ b/widgets/_dialogs.scss
@@ -162,3 +162,12 @@
 .audio-selection-device-icon {
   icon-size: $base_icon_size * 4;
 }
+
+/* Welcome dialog */
+.welcome-dialog-image {
+  background-image: url("resource:///org/gnome/shell/theme/gnome-shell-start.svg");
+  background-size: contain;
+  /* Reasonable maximum dimensions */
+  height: 300px;
+  width: 300px;
+}