demos: Brush up about dialogs

Show OS info, and generally polish this here and there.

demos/gtk-demo/main.c

@@ -146,10 +146,16 @@ activate_about (GSimpleAction *action,
     NULL
   };
   char *version;
+  char *os_name;
+  char *os_version;
   GString *s;
 
   s = g_string_new ("");
 
+  os_name = g_get_os_info (G_OS_INFO_KEY_NAME);
+  os_version = g_get_os_info (G_OS_INFO_KEY_VERSION_ID);
+  if (os_name && os_version)
+    g_string_append_printf (s, "OS\t%s %s\n\n", os_name, os_version);
   g_string_append (s, "System libraries\n");
   g_string_append_printf (s, "\tGLib\t%d.%d.%d\n",
                           glib_major_version,
@@ -184,6 +190,8 @@ activate_about (GSimpleAction *action,
 
   g_string_free (s, TRUE);
   g_free (version);
+  g_free (os_name);
+  g_free (os_version);
 }
 
 static void

demos/icon-browser/iconbrowserapp.c

@@ -50,6 +50,8 @@ about_activated (GSimpleAction *action,
   char *icon_theme;
   char *version;
   GString *s;
+  char *os_name;
+  char *os_version;
 
   g_object_get (gtk_settings_get_default (),
                 "gtk-icon-theme-name", &icon_theme,
@@ -57,6 +59,10 @@ about_activated (GSimpleAction *action,
 
   s = g_string_new ("");
 
+  os_name = g_get_os_info (G_OS_INFO_KEY_NAME);
+  os_version = g_get_os_info (G_OS_INFO_KEY_VERSION_ID);
+  if (os_name && os_version)
+    g_string_append_printf (s, "OS\t%s %s\n\n", os_name, os_version);
   g_string_append (s, "System libraries\n");
   g_string_append_printf (s, "\tGLib\t%d.%d.%d\n",
                           glib_major_version,
@@ -91,6 +97,8 @@ about_activated (GSimpleAction *action,
   g_string_free (s, TRUE);
   g_free (version);
   g_free (icon_theme);
+  g_free (os_name);
+  g_free (os_version);
 }
 
 static GActionEntry app_entries[] =

demos/print-editor/print-editor.c

@@ -1,6 +1,7 @@
 #include <config.h>
 #include <math.h>
 #include <pango/pangocairo.h>
+#include <glib/gi18n.h>
 #include <gtk/gtk.h>
 
 static GtkWidget *main_window;
@@ -597,8 +598,23 @@ activate_about (GSimpleAction *action,
   char *setting;
   char **backends;
   int i;
+  char *os_name;
+  char *os_version;
+  const char *authors[] = {
+    "Alexander Larsson",
+    NULL
+  };
+  const char *maintainers[] = {
+    "The GTK Team",
+    NULL
+  };
 
-  sysinfo = g_string_new ("System libraries\n");
+  os_name = g_get_os_info (G_OS_INFO_KEY_NAME);
+  os_version = g_get_os_info (G_OS_INFO_KEY_VERSION_ID);
+  sysinfo = g_string_new ("");
+  if (os_name && os_version)
+    g_string_append_printf (sysinfo, "OS\t%s %s\n\n", os_name, os_version);
+  g_string_append (sysinfo, "System libraries\n");
   g_string_append_printf (sysinfo, "\tGLib\t%d.%d.%d\n",
                           glib_major_version,
                           glib_minor_version,
@@ -614,8 +630,9 @@ activate_about (GSimpleAction *action,
 
   g_object_get (gtk_settings_get_default (), "gtk-print-backends", &setting, NULL);
   backends = g_strsplit (setting, ",", -1);
+  g_string_append (sysinfo, "\t");
   for (i = 0; backends[i]; i++)
-    g_string_append_printf (sysinfo, "\t%s\n", backends[i]);
+    g_string_append_printf (sysinfo, "%s ", backends[i]);
   g_strfreev (backends);
   g_free (setting);
 
@@ -632,11 +649,13 @@ activate_about (GSimpleAction *action,
                          "license-type", GTK_LICENSE_LGPL_2_1,
                          "website", "http://www.gtk.org",
                          "comments", "Program to demonstrate GTK printing",
-                         "authors", (const char *[]){ "Alexander Larsson", NULL },
+                         "authors", authors,
                          "logo-icon-name", "org.gtk.PrintEditor4.Devel",
                          "title", "About GTK Print Editor",
                          "system-information", sysinfo->str,
                          NULL);
+  gtk_about_dialog_add_credit_section (GTK_ABOUT_DIALOG (g_object_get_data (G_OBJECT (main_window), "gtk-about-dialog")),
+                                       _("Maintained by"), maintainers);
 
   g_string_free (sysinfo, TRUE);
   g_free (version);

demos/widget-factory/widget-factory.c

@@ -255,11 +255,21 @@ activate_about (GSimpleAction *action,
     "Cosimo Cecchi",
     NULL
   };
+  const char *maintainers[] = {
+    "The GTK Team",
+    NULL
+  };
   char *version;
+  char *os_name;
+  char *os_version;
   GString *s;
 
   s = g_string_new ("");
 
+  os_name = g_get_os_info (G_OS_INFO_KEY_NAME);
+  os_version = g_get_os_info (G_OS_INFO_KEY_VERSION_ID);
+  if (os_name && os_version)
+    g_string_append_printf (s, "OS\t%s %s\n\n", os_name, os_version);
   g_string_append (s, "System libraries\n");
   g_string_append_printf (s, "\tGLib\t%d.%d.%d\n",
                           glib_major_version,
@@ -292,8 +302,13 @@ activate_about (GSimpleAction *action,
                          "system-information", s->str,
                          NULL);
 
+  gtk_about_dialog_add_credit_section (GTK_ABOUT_DIALOG (g_object_get_data (G_OBJECT (gtk_application_get_active_window (app)), "gtk-about-dialog")),
+                                       _("Maintained by"), maintainers);
+
   g_string_free (s, TRUE);
   g_free (version);
+  g_free (os_name);
+  g_free (os_version);
 }
 
 static void