cups/ppd-cache.c: Put cupsSingleFile into generated PPD

Some printers are not able to print multiple files in one job via IPP Everywhere. Adding the PPD keyword enables the feature on all printers in exchange for performance degradation (there is a 1-2s pause between printed files). Fixes #643
OpenPrinting · Jun 14, 2023 · 67a8e09 · 67a8e09
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diff --git a/CHANGES.md b/CHANGES.md
@@ -6,6 +6,7 @@ Changes in CUPS v2.5b1 (TBA)
 
 - Fix segfault in `cupsGetNamedDest()` when trying to get default printer, but
   the default printer is not set (Issue #719)
+- Fix printing multiple files on specific printers (Issue #643)
 
 
 Changes in CUPS v2.4.3 (2023-06-01)

diff --git a/cups/ppd-cache.c b/cups/ppd-cache.c
@@ -5055,6 +5055,16 @@ _ppdCreateFromIPP2(
     }
   }
 
+ /*
+  * Add cupsSingleFile to support multiple files printing on printers
+  * which don't support multiple files in its firmware...
+  *
+  * Adding the keyword degrades printing performance (there is 1-2 seconds
+  * pause between files).
+  */
+
+  cupsFilePuts(fp, "*cupsSingleFile: true\n");
+
  /*
   * Close up and return...
   */