[network-manager-applet] editor: when no VPN plugin is installed, indicate that in the tooltip of "Add" button (bgo #625160)

[Jiří Klimeš <jklimes src gnome org>]

commit 91bfc960f70fd2245a36a9fbed8f140154a8ce14
Author: JiÅ?í KlimeÅ¡ <jklimes redhat com>
Date:   Thu Dec 9 09:15:42 2010 +0100

    editor: when no VPN plugin is installed, indicate that in the tooltip of "Add" button (bgo #625160)

 src/connection-editor/nm-connection-list.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/src/connection-editor/nm-connection-list.c b/src/connection-editor/nm-connection-list.c
index 54a3a2f..44b7510 100644
--- a/src/connection-editor/nm-connection-list.c
+++ b/src/connection-editor/nm-connection-list.c
@@ -1272,10 +1272,14 @@ add_connection_buttons (NMConnectionList *self,
 	g_signal_connect (button, "clicked", G_CALLBACK (add_clicked), info);
 	if (ctype == NM_TYPE_SETTING_VPN) {
 		GHashTable *plugins;
+		gboolean have_plugins;
 
 		/* disable the "Add..." button if there aren't any VPN plugins */
 		plugins = vpn_get_plugins (NULL);
-		gtk_widget_set_sensitive (button, (plugins && g_hash_table_size (plugins)));
+		have_plugins = plugins && g_hash_table_size (plugins);
+		gtk_widget_set_sensitive (button, have_plugins);
+		if (!have_plugins)
+			gtk_widget_set_tooltip_text (button, _("No VPN plugin available. Please install one to enable this button."));
 	}
 	if (new_func)
 		action_info_set_new_func (info, new_func);