SD Menu patches

Marlin/cardreader.cpp

   }
 }
 
-void CardReader::updir() {
-  if (workDirDepth > 0) {                                           // At least 1 dir has been saved
-    workDir = --workDirDepth ? workDirParents[workDirDepth] : root; // Use parent, or root if none
+int8_t CardReader::updir() {
+  if (workDirDepth > 0) {                                               // At least 1 dir has been saved
+    workDir = --workDirDepth ? workDirParents[workDirDepth - 1] : root; // Use parent, or root if none
     #if ENABLED(SDCARD_SORT_ALPHA)
       presort();
     #endif
   }
+  return workDirDepth;
 }
 
 #if ENABLED(SDCARD_SORT_ALPHA)

Marlin/cardreader.h

 
   void ls();
   void chdir(const char *relpath);
-  void updir();
+  int8_t updir();
   void setroot();
 
   uint16_t get_num_Files();

Marlin/ultralcd.cpp

     #endif
 
     void lcd_sd_updir() {
-      card.updir();
+      encoderPosition = card.updir() ? ENCODER_STEPS_PER_MENU_ITEM : 0;
       encoderTopLine = 0;
       screen_changed = true;
       lcdDrawUpdate = LCDVIEW_CLEAR_CALL_REDRAW;
     void menu_action_sddirectory(const char* filename, char* longFilename) {
       UNUSED(longFilename);
       card.chdir(filename);
-      encoderPosition = 0;
+      encoderTopLine = 0;
+      encoderPosition = 2 * ENCODER_STEPS_PER_MENU_ITEM;
       screen_changed = true;
       lcdDrawUpdate = LCDVIEW_CLEAR_CALL_REDRAW;
     }