Fix artifacts after marker move

(For faster screen update on marker move, all old area update info invalidate after use draw_all_cells(TRUE) on page switch)
Force redraw all cells after end marker move

nanovna.h

@@ -284,6 +284,7 @@ int marker_search_right(int from);
 #define REDRAW_CAL_STATUS (1<<2)
 #define REDRAW_MARKER     (1<<3)
 #define REDRAW_BATTERY    (1<<4)
+#define REDRAW_AREA       (1<<5)
 extern volatile uint8_t redraw_request;
 
 /*

plot.c

@@ -1383,6 +1383,8 @@ draw_all(bool flush)
     draw_cal_status();
   if (redraw_request & REDRAW_BATTERY)
     draw_battery_status();
+  if (redraw_request & REDRAW_AREA)
+    force_set_markmap();
   redraw_request = 0;
 }
 
@@ -1398,6 +1400,8 @@ redraw_marker(int marker)
   markmap_upperarea();
 
   draw_all_cells(TRUE);
+  // Fores redraw all area after (disable artefacts after fast marker update area)
+  redraw_request|=REDRAW_AREA;
 }
 
 void