Fix some issues with reference handling in the printing code. (#429902,

Fix some issues with reference handling in the printing code. (#429902,

2007-04-29  Matthias Clasen <mclasen@redhat.com>

        Fix some issues with reference handling in the printing
        code.  (#429902, Mathias Hasselmann)

        * gtk/gtkprintoperation.c (gtk_print_operation_finalize):
        Unref the print context, if we have one.
        (gtk_print_operation_done): Add a default ::done handler
        that unrefs the print context.
        (preview_ready): Take a reference on the print operation
        preview here.
        (print_pages_idle): ...not here,
        (preview_print_idle_done): ...and release it here.

        * tests/print-editor.c (preview_cb): Take a reference
        on the print operation here.

svn path=/trunk/; revision=17722