"increment" arg back in unsigned int type

This reverts commit 619badc.

Meter.c

@@ -320,7 +320,7 @@ static void GraphMeterMode_reallocateGraphBuffer(Meter* this, const GraphDrawCon
    data->nValues = nValues;
 }
 
-static size_t GraphMeterMode_valueCellIndex(unsigned int graphHeight, bool isPercentChart, int deltaExp, unsigned int y, unsigned int* scaleFactor, size_t* increment) {
+static size_t GraphMeterMode_valueCellIndex(unsigned int graphHeight, bool isPercentChart, int deltaExp, unsigned int y, unsigned int* scaleFactor, unsigned int* increment) {
    *scaleFactor = 1;
 
    assert(deltaExp >= 0);
@@ -559,7 +559,7 @@ static uint16_t GraphMeterMode_makeDetailsMask(const GraphColorComputeState* pre
    return mask;
 }
 
-static void GraphMeterMode_paintCellsForItem(GraphColorCell* cellsStart, size_t increment, uint8_t itemIndex, unsigned int nCells, uint16_t mask) {
+static void GraphMeterMode_paintCellsForItem(GraphColorCell* cellsStart, unsigned int increment, uint8_t itemIndex, unsigned int nCells, uint16_t mask) {
    GraphColorCell* cell = cellsStart;
    while (nCells > 0) {
       cell->c.itemNum = itemIndex + 1;
@@ -583,7 +583,7 @@ static void GraphMeterMode_computeColors(Meter* this, const GraphDrawContext* co
    assert(numDots > 0 && numDots <= (int)graphHeight * 8);
 
    unsigned int scaleFactor;
-   size_t increment;
+   unsigned int increment;
    size_t firstCellIndex = GraphMeterMode_valueCellIndex(graphHeight, isPercentChart, deltaExp, 0, &scaleFactor, &increment);
    (void)scaleFactor;
 
@@ -784,7 +784,7 @@ static void GraphMeterMode_computeColors(Meter* this, const GraphDrawContext* co
             int blanksAtTopCellArg = (new.nCellsPainted == nCellsToPaint) ? (int)blanksAtTopCell : -1;
             uint16_t mask = GraphMeterMode_makeDetailsMask(&prev, &new, prevTopPoint, rem, blanksAtTopCellArg);
 
-            GraphColorCell* cellsStart = &valueStart[firstCellIndex + increment * prev.nCellsPainted];
+            GraphColorCell* cellsStart = &valueStart[firstCellIndex + (size_t)increment * prev.nCellsPainted];
             GraphMeterMode_paintCellsForItem(cellsStart, increment, prev.nItemsPainted, nCells, mask);
          }
 
@@ -888,7 +888,7 @@ static void GraphMeterMode_recordNewValue(Meter* this, const GraphDrawContext* c
    // Clear cells
    unsigned int y = ((unsigned int)numDots + 8 - 1) / 8; // Round up
    unsigned int scaleFactor;
-   size_t increment;
+   unsigned int increment;
    size_t i = GraphMeterMode_valueCellIndex(graphHeight, isPercentChart, 0, y, &scaleFactor, &increment);
    (void)scaleFactor;
    (void)increment;
@@ -1025,7 +1025,7 @@ static int GraphMeterMode_lookupCell(const Meter* this, const GraphDrawContext*
       int deltaExpArg = deltaExp >= UINT16_WIDTH ? UINT16_WIDTH - 1 : deltaExp;
 
       unsigned int scaleFactor;
-      size_t increment;
+      unsigned int increment;
       size_t i = GraphMeterMode_valueCellIndex(graphHeight, isPercentChart, deltaExpArg, y, &scaleFactor, &increment);
       (void)increment;
       if (i == (size_t)-1)