[hist] center contour levels between zmin and zmax #20863
+17
−15
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This Pull request:
Changes or fixes:
@bgrube fyi
Before: levels go from zmin till zmax - dz <--- this is weird, they are not centered in interval, and first contour is invisible since it's at the exact min.
After: levels go from zmin + 0.5 * dz till zmax - 0.5 * dz
Fixes #20860
@linev what is the procedure to update the SVG? And why does stressSVG work on some alma? shouldn't it fail everywhere?
Checklist: