gridlines for 3D basemap sometimes don't work as expected #4387
Description
gmt basemap -R0/3/4/8/1/7 -Jz1.5 -p315/25 -BWsNeZ3 -Bxafg -Byafg -Bzafg -png map
The gridlines in the YZ and XZ planes don't extend to the Z limits.
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gmt basemap -R0/3/4/8/1/7 -Jz1.5 -p315/25 -BWsNeZ3 -Bxafg -Byafg -Bzafg -png map
The gridlines in the YZ and XZ planes don't extend to the Z limits.