[gtk+] Honor PPD reading over listing of printers

[Marek Kašík <mkasik src gnome org>]

commit 33097d65b711be31dd02fcb4b99a4dabdca63575
Author: Marek Kasik <mkasik redhat com>
Date:   Mon May 24 16:39:19 2010 +0200

    Honor PPD reading over listing of printers
    
    Reading of PPD files collides with getting list of printers.
    It helps to give higher priority to getting of PPDs than to
    getting list of printers (#614581).

 modules/printbackends/cups/gtkprintbackendcups.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/modules/printbackends/cups/gtkprintbackendcups.c b/modules/printbackends/cups/gtkprintbackendcups.c
index 8cb2e1a..3924871 100644
--- a/modules/printbackends/cups/gtkprintbackendcups.c
+++ b/modules/printbackends/cups/gtkprintbackendcups.c
@@ -116,6 +116,7 @@ struct _GtkPrintBackendCups
   guint got_default_printer   : 1;
   guint default_printer_poll;
   GtkCupsConnectionTest *cups_connection_test;
+  gint  reading_ppds;
 
   char **covers;
   int    number_of_covers;
@@ -588,6 +589,7 @@ gtk_print_backend_cups_init (GtkPrintBackendCups *backend_cups)
   backend_cups->got_default_printer = FALSE;  
   backend_cups->list_printers_pending = FALSE;
   backend_cups->list_printers_attempts = 0;
+  backend_cups->reading_ppds = 0;
 
   backend_cups->requests = NULL;
   backend_cups->auth = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, overwrite_and_free);
@@ -2142,7 +2144,7 @@ cups_request_printer_list (GtkPrintBackendCups *cups_backend)
       "auth-info-required"
     };
 
-  if (cups_backend->list_printers_pending)
+  if (cups_backend->reading_ppds > 0 || cups_backend->list_printers_pending)
     return TRUE;
 
   state = gtk_cups_connection_test_get_state (cups_backend->cups_connection_test);
@@ -2240,6 +2242,7 @@ cups_request_ppd_cb (GtkPrintBackendCups *print_backend,
 
   printer = GTK_PRINTER (data->printer);
   GTK_PRINTER_CUPS (printer)->reading_ppd = FALSE;
+  print_backend->reading_ppds--;
 
   if (gtk_cups_result_is_error (result))
     {
@@ -2386,6 +2389,7 @@ cups_request_ppd (GtkPrinter *printer)
 
 
   cups_printer->reading_ppd = TRUE;
+  GTK_PRINT_BACKEND_CUPS (print_backend)->reading_ppds++;
 
   cups_request_execute (GTK_PRINT_BACKEND_CUPS (print_backend),
                         request,