Fix graph coloring algorithm (again, this time I get it right).

Meter.c

@@ -435,10 +435,12 @@ static void GraphMeterMode_draw(Meter* this, int x, int y, int w) {
          double maxArea = 0.0;
          for (int i = 0; i < items; i++) {
              double area;
-             area = MIN(currentItemSums[i], this->total * (GRAPH_HEIGHT - line) / GRAPH_HEIGHT) +
-                    MIN(prevItemSums[i], this->total * (GRAPH_HEIGHT - line) / GRAPH_HEIGHT);
-             area -= MAX(((i > 0) ? currentItemSums[i-1] : 0), this->total * (GRAPH_HEIGHT - 1 - line) / GRAPH_HEIGHT) +
-                     MAX(((i > 0) ? currentItemSums[i-1] : 0), this->total * (GRAPH_HEIGHT - 1 - line) / GRAPH_HEIGHT);
+             double upperBound = this->total * (GRAPH_HEIGHT - line) / GRAPH_HEIGHT;
+             double lowerBound = this->total * (GRAPH_HEIGHT - 1 - line) / GRAPH_HEIGHT;
+             area = MAX(lowerBound, MIN(currentItemSums[i], upperBound)) +
+                    MAX(lowerBound, MIN(prevItemSums[i], upperBound));
+             area -= MAX(lowerBound, MIN(((i > 0) ? currentItemSums[i-1] : 0), upperBound)) +
+                     MAX(lowerBound, MIN(((i > 0) ? prevItemSums[i-1] : 0), upperBound));
              if (area > maxArea) {
                 maxArea = area;
                 dominantColor = CRT_colors[Meter_attributes(this)[i]];