Tweak and use SD_ORDER

Marlin/src/lcd/dwin/dwin.cpp

@@ -1547,8 +1547,9 @@ millis_t shift_ms; // = 0
 inline void Init_Shift_Name() {
   const bool is_subdir = !card.flag.workDirIsRoot;
   const int8_t filenum = select_file.now - 1 - is_subdir; // Skip "Back" and ".."
-  if (WITHIN(filenum, 0, card.get_num_Files() - 1)) {
+  const uint16_t fileCnt = card.get_num_Files();
-    card.getfilename_sorted(filenum);
+  if (WITHIN(filenum, 0, fileCnt - 1)) {
+    card.getfilename_sorted(SD_ORDER(filenum, fileCnt));
     char * const name = card.longest_filename();
     make_name_without_ext(shift_name, name, 100);
   }
@@ -1898,7 +1899,7 @@ void HMI_SelectFile(void) {
     }
     else {
       const uint16_t filenum = select_file.now - 1 - hasUpDir;
-      card.getfilename_sorted(filenum);
+      card.getfilename_sorted(SD_ORDER(filenum, card.get_num_Files()));
 
       // Enter that folder!
       if (card.flag.filenameIsDir) {
@@ -3415,10 +3416,11 @@ void EachMomentUpdate(void) {
       DWIN_Draw_Rectangle(0, c2, 144, 305, 247, 346);
     };
 
-    LOOP_L_N(i, card.get_num_Files()) {
+    const uint16_t fileCnt = card.get_num_Files();
+    for (uint16_t i = 0; i < fileCnt; i++) {
       // TODO: Resume print via M1000 then update the UI
       // with the active filename which can come from CardReader.
-      card.getfilename_sorted(i);
+      card.getfilename_sorted(SD_ORDER(i, fileCnt));
       if (!strcmp(card.filename, &recovery.info.sd_filename[1])) { // Resume print before power failure while have the same file
         recovery_flag = 1;
         HMI_flag.select_flag = 1;

Marlin/src/lcd/menu/menu_media.cpp

@@ -126,7 +126,7 @@ void menu_media() {
 
   if (ui.should_draw()) for (uint16_t i = 0; i < fileCnt; i++) {
     if (_menuLineNr == _thisItemNr) {
-      card.getfilename_sorted(i);
+      card.getfilename_sorted(SD_ORDER(i, fileCnt));
       if (card.flag.filenameIsDir)
         MENU_ITEM(sdfolder, MSG_MEDIA_MENU, card);
       else

Marlin/src/sd/cardreader.cpp

@@ -947,7 +947,7 @@ void CardReader::cdroot() {
 
         // Init sort order.
         for (uint16_t i = 0; i < fileCnt; i++) {
-          sort_order[i] = SD_ORDER(i, fileCnt);
+          sort_order[i] = i;
           // If using RAM then read all filenames now.
           #if ENABLED(SDSORT_USES_RAM)
             selectFileByIndex(i);

Marlin/src/sd/cardreader.h

@@ -31,7 +31,11 @@
   #define SD_RESORT 1
 #endif
 
-#define SD_ORDER(N,C) (TERN(SDCARD_RATHERRECENTFIRST, C - 1 - (N), N))
+#if ENABLED(SDCARD_RATHERRECENTFIRST) && DISABLED(SDCARD_SORT_ALPHA)
+  #define SD_ORDER(N,C) ((C) - 1 - (N))
+#else
+  #define SD_ORDER(N,C) N
+#endif
 
 #define MAX_DIR_DEPTH     10       // Maximum folder depth
 #define MAXDIRNAMELENGTH   8       // DOS folder name size