wouter bolsterlee authored Jan 10, 2020 and Philip Withnall committed Jan 16, 2020

This adds support for specifying multiple directories in the
GSETTINGS_SCHEMA_DIR environment variable by separating the values
using G_SEARCHPATH_SEPARATOR_S (colon on UNIX-like systems).

While programs could already register multiple custom GSettings schema
directories, it was not possible to achieve the same without writing
custom code, e.g. when using the gsettings command line tool.

Fixes #1998.