[Esteban82]

Claude found a few bugs in the legend module:

1. F red - blue: the - (no fill) did not take up its column, so the colors shifted: B got blue and C got no fill.
2. S - L ... (confidence band) with N 2: the first pass counted the band and its line as two cells but drawing counts one, so the legend box was too short and the last symbol fell outside the frame.
3. G 0.5l: atoi truncated the number of lines, so fractional gaps (0.5l, 1.5l) gave no gap or a shorter one.
4. M after an S whose pen starts with f (e.g. faint): the M record read leftover arguments from the previous record and drew the fancy scale although +f was not requested.
5. Also fixed the names used when dumping data sets in DEBUG builds (one name was missing, so they were shifted).

Tested with

gmt begin legend_bugs png
	gmt basemap -R-20/20/-20/20 -JM5c -B0
	# 1. F red - blue: esperado A rojo, B sin relleno, C azul
	printf 'N 3\nF red - blue\nS - c 0.3c black 0.5p - A\nS - c 0.3c black 0.5p - B\nS - c 0.3c black 0.5p - C\n' | gmt legend -DjTL+w4c+o0.5c/0.5c -F+p0.5p
	# 2. Banda de confianza con N 2: esperado las dos filas dentro del marco
	printf 'N 2\nS - L 0.4c lightred 0.25p - Band\nS - - 0.4c - 1p,red\nS - c 0.25c blue 0.25p - Circle\nS - t 0.25c green 0.25p - Triangle\n' | gmt legend -DjTL+w4c+o0.5c/1.5c -F+p0.5p
	# 3. G 0.5l: esperado media linea entre A y B (lineas base con +d)
	printf 'S - c 0.3c red 0.5p - A\nG 0.5l\nS - c 0.3c blue 0.5p - B\n' | gmt legend -DjTL+w4c+o0.5c/2.5c -F+p0.5p+d
	# 4. M despues de pluma "faint": esperado escala simple (sin +f)
	printf 'S - c 0.3c red faint - Circle\nM - 0 500k+u\n' | gmt legend -DjTL+w4c+o0.5c/3.8c -F+p0.5p
gmt end

Buggy / Fixed

The bugs were found and the fixes reviewed by Claude Opus 5.5.

[Esteban82]

The fix for the G record affects ex22.sh. I will take a look.

[Esteban82]

In the example 22, the G record used to truncate "0.25l" to 0 lines, so this line never added any gap. Now that fractional line gaps are honored, it would move the text below it down by about 1 mm and the USGS logo would touch the legend frame. Removing the line keeps the figure identical to the current baseline image.

[Esteban82]

Now the test ex22 passes.