gplugin/gplugin

Make GPluginManager a final type

2021-10-12, Gary Kramlich
a1b0fd07c7f1
Make GPluginManager a final type

* Use g_signal_new_class_handler to handle the accumulator based signals
* Remove the optional struct offset for the non accumulator based signals
* This all fixes the warnings from vapigen as well

Testing Done:
Ran the unit tests, gplugin-query, and gplugin-gtk3-viewer without issue.

Reviewed at https://reviews.imfreedom.org/r/1028/
if not get_option('install-gplugin-query')
summary('gplugin-query',
'You have disabled installation of gplugin-query which is a very ' +
'useful diagnostics tool.',
section : 'Warnings')
endif
gplugin_query = executable('gplugin-query',
'gplugin-query.c',
dependencies : [gplugin_dep, GLIB, GOBJECT],
install : get_option('install-gplugin-query'))
if get_option('help2man')
custom_target('gplugin-query.1',
command : [help2man,
'--name=Query installed plugins', '--section=1',
'--help-option=--help-all', '--no-info',
'--output', '@OUTPUT@',
gplugin_query],
output : 'gplugin-query.1',
install : get_option('install-gplugin-query'),
install_dir : get_option('mandir') / 'man1')
endif