Add "headers-collapsed" setting.

Replaces "paned-view-headers-state", which was defined as an integer for
some stupid reason.  Not bothering to migrate the old setting since it's
one button click.

data/evolution.convert

@@ -163,7 +163,6 @@ mime-types = /apps/evolution/mail/display/mime_types
 monospace-font = /apps/evolution/mail/display/fonts/monospace
 no-folder-dots = /apps/evolution/mail/display/no_folder_dots
 paned-size = /apps/evolution/mail/display/paned_size
-paned-view-headers-state = /apps/evolution/mail/display/paned_view_headers_state
 photo-local = /apps/evolution/mail/display/photo_local
 prompt-check-if-default-mailer = /apps/evolution/mail/prompts/checkdefault
 prompt-on-delete-in-vfolder = /apps/evolution/mail/prompts/delete_in_vfolder

data/org.gnome.evolution.mail.gschema.xml.in

@@ -284,10 +284,9 @@
       <_summary>Height of the message-list pane</_summary>
       <_description>Height of the message-list pane.</_description>
     </key>
-    <key name="paned-view-headers-state" type="i">
-      <default>0</default>
-      <_summary>State of message headers in paned view</_summary>
-      <_description>Describes whether message headers in paned view should be collapsed or expanded by default. "0" = expanded and "1" = collapsed</_description>
+    <key name="headers-collapsed" type="b">
+      <default>false</default>
+      <_summary>Whether message headers are collapsed in the user interface</_summary>
     </key>
     <key name="hpaned-size" type="i">
       <default>450</default>

mail/e-mail-paned-view.c

@@ -624,8 +624,7 @@ mail_paned_view_constructed (GObject *object)
 	EShellBackend *shell_backend;
 	EShellWindow *shell_window;
 	EShellView *shell_view;
-	EShell *shell;
-	EShellSettings *shell_settings;
+	GSettings *settings;
 	EMailReader *reader;
 	EMailBackend *backend;
 	EMailSession *session;
@@ -644,16 +643,21 @@ mail_paned_view_constructed (GObject *object)
 	shell_view = e_mail_view_get_shell_view (view);
 	shell_window = e_shell_view_get_shell_window (shell_view);
 	shell_backend = e_shell_view_get_shell_backend (shell_view);
-	shell = e_shell_window_get_shell (shell_window);
-	shell_settings = e_shell_get_shell_settings (shell);
 
 	backend = E_MAIL_BACKEND (shell_backend);
 	session = e_mail_backend_get_session (backend);
 
-	g_object_bind_property (
-		shell_settings, "paned-view-headers-state",
+	/* FIXME This should be an EMailPanedView property, so
+	 *       it can be configured from the settings module. */
+
+	settings = g_settings_new ("org.gnome.evolution.mail");
+
+	g_settings_bind (
+		settings, "headers-collapsed",
 		priv->display, "headers-collapsed",
-		G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);
+		G_SETTINGS_BIND_DEFAULT);
+
+	g_object_unref (settings);
 
 	/* Build content widgets. */
 

modules/mail/e-mail-shell-settings.c

@@ -362,9 +362,9 @@ e_mail_shell_settings_init (EShellBackend *shell_backend)
 		"composer-gallery-path");
 
 	e_shell_settings_install_property_for_key (
-		"paned-view-headers-state",
+		"mail-headers-collapsed",
 		MAIL_SCHEMA,
-		"paned-view-headers-state");
+		"headers-collapsed");
 
 	e_shell_settings_install_property (
 		g_param_spec_enum (