[gimp] app: make sure we send the origin display to plug-ins through PDB.

[Jehan <jehanp src gnome org>]

commit 1566d9437ea359965cbb8a650cf372473838d04e
Author: Jehan <jehan girinstud io>
Date:   Fri Apr 30 03:48:12 2021 +0200

    app: make sure we send the origin display to plug-ins through PDB.

 app/plug-in/gimppluginmanager-call.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/app/plug-in/gimppluginmanager-call.c b/app/plug-in/gimppluginmanager-call.c
index de03e111dc..a90dcfb014 100644
--- a/app/plug-in/gimppluginmanager-call.c
+++ b/app/plug-in/gimppluginmanager-call.c
@@ -196,6 +196,9 @@ gimp_plug_in_manager_call_run (GimpPlugInManager   *manager,
           return return_vals;
         }
 
+      if (! display)
+        display = gimp_context_get_display (context);
+
       display_id = display ? gimp_display_get_id (display) : -1;
 
       icon_theme_dir = gimp_get_icon_theme_dir (manager->gimp);