gmtinfo - extended regions are not correctly output with -C

[jaltekruse-usgs]

Extending the region with gmt info was fixed in PR #7460 and it seems to work as expected. However, if the -C flag is used to output values in columns instead of -Rwest/east/south/north format, the unextended region is returned.

Full script that generated the error

Expanding the test case in #7460:

cat << EOF > data.txt
-125	37.6
-111.1	49.2
-121.49	42.5
EOF
# 0. Exact extent
gmt info data.txt -Ie > result.txt
gmt info data.txt -Ie -C >> result.txt
# 1. Round to nearest 0.5
gmt info data.txt -I0.5 >> result.txt
gmt info data.txt -I0.5 -C >> result.txt
# 2. Extend outward by 1, then round to nearest 0.5
gmt info data.txt -I0.5+R1 >> result.txt
gmt info data.txt -I0.5+R1 -C >> result.txt
# 3. Round to nearest 0.5, then round to nearest 1
gmt info data.txt -I0.5+r1 >> result.txt
gmt info data.txt -I0.5+r1 -C >> result.txt
# 4. Round to nearest 0.5, then extend by 1
gmt info data.txt -I0.5+e1 >> result.txt
gmt info data.txt -I0.5+e1 -C >> result.txt

On macOS 13.6.5, gmt 6.5.0, this gives:

-R-125/-111.1/37.6/49.2
-125	-111.1	37.6	49.2
-R-125/-111/37.5/49.5
-125	-111	37.5	49.5
-R-126/-110/36.5/50.5
-125	-111	37.5	49.5
-R-125/-111/37/50
-125	-111	37.5	49.5
-R-126/-110/37/50
-125	-111	37.5	49.5

And I believe this is the correct output:

-R-125/-111.1/37.6/49.2
-125	-111.1	37.6	49.2
-R-125/-111/37.5/49.5
-125	-111	37.5	49.5
-R-126/-110/36.5/50.5
-126	-110	36.5	50.5
-R-125/-111/37/50
-125	-111	37	50
-R-126/-110/37/50
-126	-110	37	50

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[joa-quim]

Thanks, I've committed a fix in #8416