I see. Well... I hadn't had any problems with it.

I tried your script and with slight changes it works well under a regular user. Full setup:

sudo -i
cat > /usr/bin/geany-stdin << "EOF"
#!/usr/bin/env bash

TMPFILE=$(mktemp -p ~)
trap 'rm -f "$TMPFILE"' exit
cat - > "$TMPFILE"
geany $@ "$TMPFILE"
EOF
chmod +x /usr/bin/geany-stdin
exit

ls -l | geany-stdin

gksudo is another matter but I can work around it.

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