[gnome-shell/wip/hadess/welcome-tour] main: Show welcome tour dialogue on first start

[Bastien Nocera <hadess src gnome org>]

commit a995806cfef1497237bc6c8cc0c42b320563d31e
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Feb 1 13:31:41 2021 +0100

    main: Show welcome tour dialogue on first start
    
    This hooks the recently added welcome tour dialogue to be shown the
    first time a new session is started, and disabled after that.
    
    Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3632

 data/org.gnome.shell.gschema.xml.in | 10 ++++++++++
 js/ui/main.js                       | 14 ++++++++++++++
 2 files changed, 24 insertions(+)
---
diff --git a/data/org.gnome.shell.gschema.xml.in b/data/org.gnome.shell.gschema.xml.in
index 0ae047e188..55817e8797 100644
--- a/data/org.gnome.shell.gschema.xml.in
+++ b/data/org.gnome.shell.gschema.xml.in
@@ -94,6 +94,16 @@
         adapter is ever seen not to have devices associated to it.
       </description>
     </key>
+    <key name="welcome-dialog-last-shown-version" type="s">
+      <default>''</default>
+      <summary>The last version the “Welcome to GNOME” dialogue was shown for</summary>
+      <description>
+        This key determines when the “Welcome to GNOME” dialog was last shown for.
+        An empty string represents the oldest possible version, and huge number will
+        represents versions that do not exist yet, and should be used to disable the
+        dialogue should that be needed.
+      </description>
+    </key>
     <key name="introspect" type="b">
       <default>false</default>
       <summary>Enable introspection API</summary>
diff --git a/js/ui/main.js b/js/ui/main.js
index f488279d07..544bb1d571 100644
--- a/js/ui/main.js
+++ b/js/ui/main.js
@@ -47,9 +47,12 @@ const KbdA11yDialog = imports.ui.kbdA11yDialog;
 const LocatePointer = imports.ui.locatePointer;
 const PointerA11yTimeout = imports.ui.pointerA11yTimeout;
 const ParentalControlsManager = imports.misc.parentalControlsManager;
+const Config = imports.misc.config;
+const Util = imports.misc.util;
 
 const A11Y_SCHEMA = 'org.gnome.desktop.a11y.keyboard';
 const STICKY_KEYS_ENABLE = 'stickykeys-enable';
+const WELCOME_DIALOG_LAST_SHOWN_VERSION = 'welcome-dialog-last-shown-version';
 const LOG_DOMAIN = 'GNOME Shell';
 const GNOMESHELL_STARTED_MESSAGE_ID = 'f3ea493c22934e26811cd62abe8e203a';
 
@@ -297,6 +300,9 @@ function _initializeUI() {
         if (credentials.get_unix_user() === 0) {
             notify(_('Logged in as a privileged user'),
                    _('Running a session as a privileged user should be avoided for security reasons. If 
possible, you should log in as a normal user.'));
+        } else if (sessionMode.currentMode !== 'gdm' &&
+                   sessionMode.currentMode !== 'initial-setup') {
+            _handleShowWelcomeScreen();
         }
 
         if (sessionMode.currentMode !== 'gdm' &&
@@ -314,6 +320,14 @@ function _initializeUI() {
     });
 }
 
+function _handleShowWelcomeScreen() {
+    const lastShownVersion = global.settings.get_string(WELCOME_DIALOG_LAST_SHOWN_VERSION);
+    if (Util.GNOMEversionCompare (Config.PACKAGE_VERSION, lastShownVersion) > 0) {
+        openWelcomeDialog();
+        global.settings.set_string(WELCOME_DIALOG_LAST_SHOWN_VERSION, Config.PACKAGE_VERSION);
+    }
+}
+
 async function _handleLockScreenWarning() {
     const path = '%s/lock-warning-shown'.format(global.userdatadir);
     const file = Gio.File.new_for_path(path);