fix(table): add missing invalidation when changeing cell type

fixes https://forum.lvgl.io/t/bug-of-table-click-to-change-style/3842

CHANGELOG.md

@@ -20,6 +20,7 @@
 - fix reference to LV_DRAW_BUF_MAX_NUM in lv_mem.c
 - fix(polygon draw) join adjacent points if they are on the same coordinate
 - fix(linemeter) fix invalidation when setting new value 
+- fix(table) add missing invalidation when changeing cell type
 
 ## v7.7.2 (17.11.2020)
 ### Bugfixes

src/lv_widgets/lv_table.c

@@ -467,6 +467,8 @@ void lv_table_set_cell_type(lv_obj_t * table, uint16_t row, uint16_t col, uint8_
     ext->cell_data[cell][0] = format.format_byte;
 
     ext->cell_types |= 1 << type;
+
+    lv_obj_invalidate(table);
 }
 
 /**