minor update of comments in code

include/graphics/map/MapPanel.h

@@ -9,8 +9,12 @@
 #include <unordered_map>
 
 /**
- * Size independent map for x/y/z raster tiles
+ * Size independent map panel for x/y/z raster tiles
  * Draws the tiles and objects to the provided lvgl panel.
+ * Stores three positions:
+ *   - home
+ *   - GPS (current)
+ *   - scrolled (manual)
  */
 class MapPanel
 {

source/graphics/map/MapPanel.cpp

@@ -250,7 +250,7 @@ void MapPanel::scroll(int16_t deltaX, int16_t deltaY, uint16_t fraction)
             tilesY++;
         }
     } else {
-        ILOG_ERROR("scroll: start tile %d/%d", xStart, yStart);
+        ILOG_ERROR("scroll: start tile %d/%d missing", xStart, yStart);
         return;
     }
     // check if scrolling requires new tiles at the ending row or column