Apart from Dan's suggestions in patch 1, the series looks good to me.
FWIW RHEL 7 (the earliest distro with PCRE 2) has glib2 2.56.1 &
gtk3 3.22.30, so supporting any earlier versions also seems pointless,
so that might be another thing to review. We could make USE_POPOVERS
unconditional, and make gui-gtk3-compat.h considerably less
complicated.
Rich.
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