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Because POSIX sh was, with hindsight, not a particularly well-designed programming language, if we don't 'set -e', then we'll respond to failure of a setup command such as cd by carrying on regardless. Signed-off-by: Simon McVittie <smcv@debian.org> Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2009>