variant 12c

This reverts commit 68ba867.

Meter.c

@@ -780,8 +780,8 @@ static void GraphMeterMode_computeColors(Meter* this, const GraphDrawContext* co
             if (prev.nCellsPainted == 0) {
                assert(adjSmall.nCells == 0);
                rItemHasExtraCell = true;
-            } else if (y >= nCellsToPaint - 1) {
-               assert(y == nCellsToPaint - 1);
+            } else if (y + 1 >= nCellsToPaint) {
+               assert(y + 1 == nCellsToPaint);
                assert(adjSmall.nCells == 0);
                assert(nCells == 0);
                rItemHasExtraCell = false;