Fix an issue of retrieving properties for Compound Triggers. It's a regression of #4006. Fixes #4952.

docs/en_US/release_notes_4_16.rst

@@ -37,6 +37,7 @@ Bug fixes
 | `Issue #4933 <https://redmine.postgresql.org/issues/4933>`_ -  Ensure that the Servers collection node should expand independently of server connections.
 | `Issue #4934 <https://redmine.postgresql.org/issues/4934>`_ -  Fix the help button link on the User Management dialog.
 | `Issue #4935 <https://redmine.postgresql.org/issues/4935>`_ -  Fix accessibility issues.
+| `Issue #4952 <https://redmine.postgresql.org/issues/4952>`_ -  Fix an issue of retrieving properties for Compound Triggers. It's a regression of #4006.
 | `Issue #4964 <https://redmine.postgresql.org/issues/4964>`_ -  Fix an issue where length and precision are not removed from table/column dialog.
 | `Issue #4965 <https://redmine.postgresql.org/issues/4965>`_ -  Fix an issue where the Interval data type is not displayed in the properties dialog of table/column.
 | `Issue #4978 <https://redmine.postgresql.org/issues/4978>`_ -  Fix pgAdmin4 failed to start issue after upgrading to version 4.15.

web/pgadmin/browser/server_groups/servers/databases/schemas/tables/templates/compound_triggers/sql/ppas/12_plus/properties.sql

@@ -4,10 +4,10 @@ SELECT t.oid,t.tgname AS name, t.xmin, t.tgenabled AS is_enable_trigger, t.tgtyp
     regexp_replace(regexp_replace(pg_get_triggerdef(t.oid),
         'CREATE TRIGGER (.*) FOR (.*) ON (.*) \nCOMPOUND TRIGGER (.*)\n', ''), '[\n]?END$', ''
     ) AS prosrc,
-    COALESCE(substring(pg_get_triggerdef(t.oid), 'WHEN (.*) \nCOMPOUND'), NULL) AS whenclause,
 {% if datlastsysoid %}
-    (CASE WHEN t.oid <= {{ datlastsysoid}}::oid THEN true ElSE false END) AS is_sys_trigger
+    (CASE WHEN t.oid <= {{ datlastsysoid}}::oid THEN true ElSE false END) AS is_sys_trigger,
 {% endif %}
+    COALESCE(substring(pg_get_triggerdef(t.oid), 'WHEN (.*) \nCOMPOUND'), NULL) AS whenclause
 FROM pg_trigger t
     JOIN pg_class cl ON cl.oid=tgrelid
     JOIN pg_namespace na ON na.oid=relnamespace