Stupid me,
it's working of course!
I assumed that Set(@Plugins, works in a setter/getter manner
and in addition the debain way to manage RT_SiteConfig.pm
is to have a conf.d style directory /etc/request-tracker4/RT_SiteConfig.d/
with several config snippets and I had this in one file:
Set(@Plugins,'RT::Extension::JSGantt');
and this in another:
Set(@Plugins, qw(RT::Extension::LDAPImport));
So "Set(@Plugins ... " got overwritten.
The correct way is to have only one "Set(@Plugins ... " like this:
Set(@Plugins, qw(
RT::Extension::LDAPImport
RT::Extension::JSGantt
));
Sorry for wasting your time.
