[gparted] Increase robustness of help manual launch

[Curtis Gedak <gedakc src gnome org>]

commit 6395970e6b259e7fe0eb9edfcae443d078ec7337
Author: Curtis Gedak <gedakc gmail com>
Date:   Mon Jan 17 09:26:28 2011 -0700

    Increase robustness of help manual launch
    
    Add direct invocation of yelp if normal open help manual methods
    fail.

 src/Win_GParted.cc |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/Win_GParted.cc b/src/Win_GParted.cc
index 677e4f1..c36b573 100644
--- a/src/Win_GParted.cc
+++ b/src/Win_GParted.cc
@@ -1236,6 +1236,13 @@ void Win_GParted::show_help_dialog( const Glib::ustring & filename /* E.g., gpar
 	Glib::ustring command = "gnome-open " + uri ;
 	gdk_spawn_command_line_on_screen( gscreen, command .c_str(), &error ) ;
 #endif
+	if ( error != NULL )
+	{
+		//Try opening yelp application directly
+		g_clear_error( &error ) ;  //Clear error from trying to open gparted help manual above (gtk_show_uri or gnome-open).
+		Glib::ustring command = "yelp " + uri ;
+		gdk_spawn_command_line_on_screen( gscreen, command .c_str(), &error ) ;
+	}
 
 	if ( error != NULL )
 	{