bug 235763 Print dialog show list printer descriptions if available

patch by Roland Mainz <roland.mainz@nrubsig.org> r+sr=roc

widget/src/gtk2/nsDeviceContextSpecG.cpp

@@ -1034,6 +1034,11 @@ nsresult GlobalPrinters::InitializeGlobalPrinters ()
   if (!mGlobalPrinterList) 
     return NS_ERROR_OUT_OF_MEMORY;
 
+  nsresult rv;
+  nsCOMPtr<nsIPref> pPrefs = do_GetService(NS_PREF_CONTRACTID, &rv);
+  if (NS_FAILED(rv))
+    return rv;
+      
 #ifdef USE_XPRINT   
   XPPrinterList plist = XpuGetPrinterList(nsnull, &mGlobalNumPrinters);
   
@@ -1042,7 +1047,11 @@ nsresult GlobalPrinters::InitializeGlobalPrinters ()
     int i;
     for( i = 0 ; i < mGlobalNumPrinters ; i++ )
     {
-      mGlobalPrinterList->AppendString(nsString(NS_ConvertASCIItoUCS2(plist[i].name)));
+      /* Add name to our list of printers... */
+      mGlobalPrinterList->AppendString(nsString(NS_ConvertUTF8toUCS2(plist[i].name)));
+
+      /* ... and store the description text for this printer */
+      pPrefs->SetCharPref(nsPrintfCString(256, "print.printer_%s.printer_description", plist[i].name).get(), plist[i].desc);      
     }
     
     XpuFreePrinterList(plist);
@@ -1050,7 +1059,6 @@ nsresult GlobalPrinters::InitializeGlobalPrinters ()
 #endif /* USE_XPRINT */
 
 #ifdef USE_POSTSCRIPT
-  nsCOMPtr<nsIPref> pPrefs = do_GetService(NS_PREF_CONTRACTID);
   PRBool psPrintModuleEnabled = PR_TRUE;
 
   const char *val = PR_GetEnv("MOZILLA_POSTSCRIPT_ENABLED");
@@ -1060,12 +1068,10 @@ nsresult GlobalPrinters::InitializeGlobalPrinters ()
   }
   else
   {
-    if (pPrefs) {
     if (NS_FAILED(pPrefs->GetBoolPref("print.postscript.enabled", &psPrintModuleEnabled))) {
       psPrintModuleEnabled = PR_TRUE;
     }
   }
-  }
 
   if (psPrintModuleEnabled) {
     /* Get the list of PostScript-module printers */
@@ -1076,10 +1082,8 @@ nsresult GlobalPrinters::InitializeGlobalPrinters ()
     printerList = PR_GetEnv("MOZILLA_POSTSCRIPT_PRINTER_LIST");
 
     if (!printerList) {
-      if (pPrefs) {
       (void) pPrefs->CopyCharPref("print.printer_list", &printerList);
     }  
-    }  
 
     if (printerList) {
       char       *tok_lasts;