Draw line between graphs and waterfall

nanovna.h

@@ -614,7 +614,7 @@ extern uint16_t graph_bottom;
 //
 #define CELLOFFSETX 0
 #define AREA_WIDTH_NORMAL  (CELLOFFSETX + WIDTH)
-#define AREA_HEIGHT_NORMAL (              HEIGHT + 1)
+#define AREA_HEIGHT_NORMAL (              HEIGHT)
 
 #define GRID_X_TEXT       (AREA_WIDTH_NORMAL - 7*5)
 

plot.c

@@ -2117,7 +2117,7 @@ static void update_waterfall(void){
   int i;
   int w_width = area_width < WIDTH ? area_width : WIDTH;
 //  START_PROFILE;
-  for (i = CHART_BOTTOM-1; i >=graph_bottom+1; i--) {		// Scroll down
+  for (i = CHART_BOTTOM-1; i >=graph_bottom; i--) {		// Scroll down
     ili9341_read_memory(OFFSETX, i, w_width, 1, spi_buffer);
     ili9341_bulk(OFFSETX, i+1, w_width, 1);
   }
@@ -2188,7 +2188,7 @@ static void update_waterfall(void){
       spi_buffer[j++] = color;
     }
   }
-  ili9341_bulk(OFFSETX, graph_bottom+1, w_width, 1);
+  ili9341_bulk(OFFSETX, graph_bottom, w_width, 1);
 //  STOP_PROFILE;
 }
 #if 0