To make indentation work with less effort. The modeline was copied from
libostree with minor modification and the .editorconfig from GLib.
The advantage of having both a modeline and an editorconfig is we can
work out of the box on more editor setups, and the modeline allows us to
specify the style with a lot more fine grained control.
For the portal's use of --env-fd= to be safe, we want the environment
variables that it sets to end up in the environment for the program
that is run by `bwrap` as process 2, but they must not go into the
environment that gets used to run `flatpak run` or `bwrap`. Assert
that this is the case.
For completeness, we're testing both --env= and --env-fd= here,
even though the earlier commit
"portal: Do not use caller-supplied variables in environment"
always uses --env-fd=.
Part-of: https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2
Signed-off-by: Simon McVittie <smcv@collabora.com>
