Emmanuele Bassi authored May 20, 2020 and Torsten Schönfeld committed May 24, 2020

After GLib gained support for structured log messages, it started
handling info-level messages differently, by showing them only if the
G_MESSAGES_DEBUG environment variable is set to either "all" or to a
colon-separated list of log domains that include the log domain used by
the message.

The Perl bindings override the old, unstructured log message function,
which disables all the logging capabilities inside GLib. Since the Perl
bindings currently do not support G_LOG_MESSSAGE_INFO and
G_LOG_MESSAGE_DEBUG messages, this means that Perl applications and
modules will always print out debugging messages that would normally not
be visible; additionally, the info-level messages use a generic "LOG"
marker which makes them look like actual warnings, instead of the debugging
messages they are.

In order to fix this, and be backward compatible with older versions of
GLib, we need to reimplement the logging logic from GLib into our own
bindings. This also means adding the ability ...