[gimp] app: ref the GimpProgress in gimp_procedure_execute[_async]()

[Michael Natterer <mitch src gnome org>]

commit 03085f491dd9efaf07ec4f47ce89ab0201f1064f
Author: Michael Natterer <mitch gimp org>
Date:   Sun May 28 17:37:32 2017 +0200

    app: ref the GimpProgress in gimp_procedure_execute[_async]()
    
    around calling the actual execute vfuncs, Seen a crash when quitting
    GIMP while a script-fu window was open, the progress was already
    finalized. Now it simply prints the error message about the failing
    script on the concole.

 app/pdb/gimpprocedure.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/app/pdb/gimpprocedure.c b/app/pdb/gimpprocedure.c
index a30d430..f14bdc9 100644
--- a/app/pdb/gimpprocedure.c
+++ b/app/pdb/gimpprocedure.c
@@ -414,6 +414,9 @@ gimp_procedure_execute (GimpProcedure   *procedure,
   else
     context = gimp_pdb_context_new (gimp, context, TRUE);
 
+  if (progress)
+    g_object_ref (progress);
+
   /*  call the procedure  */
   return_vals = GIMP_PROCEDURE_GET_CLASS (procedure)->execute (procedure,
                                                                gimp,
@@ -422,6 +425,9 @@ gimp_procedure_execute (GimpProcedure   *procedure,
                                                                args,
                                                                error);
 
+  if (progress)
+    g_object_unref (progress);
+
   g_object_unref (context);
 
   if (return_vals)
@@ -499,10 +505,16 @@ gimp_procedure_execute_async (GimpProcedure  *procedure,
       else
         context = gimp_pdb_context_new (gimp, context, TRUE);
 
+      if (progress)
+        g_object_ref (progress);
+
       GIMP_PROCEDURE_GET_CLASS (procedure)->execute_async (procedure, gimp,
                                                            context, progress,
                                                            args, display);
 
+      if (progress)
+        g_object_unref (progress);
+
       g_object_unref (context);
     }
 }