Restructure fileList to load faster.

Marlin/src/inc/Version.h

@@ -41,7 +41,7 @@
  * here we define this default string as the date where the latest release
  * version was tagged.
  */
- #define CUSTOM_BUILD_VERSION "1.5.1-pre"
+ #define CUSTOM_BUILD_VERSION "1.5.1"
 
 #ifndef STRING_DISTRIBUTION_DATE
   #define STRING_DISTRIBUTION_DATE "2023-06-09"

Marlin/src/lcd/extui/knutwurst/anycubic_touchscreen.cpp

@@ -646,11 +646,17 @@
 
 void AnycubicTouchscreenClass::RenderCurrentFileList() {
   currentFileOrDirectory[0] = 0;
+  uint16_t selectedNumber = 0;
+  FileList currentFileList;
   
   if (SpecialMenu == false) {
     currentTouchscreenSelection[0] = 0;
   }
 
+  if (CodeSeen('S')) {
+    selectedNumber = CodeValue();
+  }
+
   // Filelist start
   SEND_PGM("FN ");
   SENDLINE_PGM("");
@@ -659,13 +665,6 @@ void AnycubicTouchscreenClass::RenderCurrentFileList() {
     SENDLINE_PGM(SM_SPECIAL_MENU_S);
     SENDLINE_PGM(SM_SPECIAL_MENU_L);
   } else {
-    uint16_t selectedNumber = 0;
-    FileList currentFileList;
-
-    if (CodeSeen('S')) {
-      selectedNumber = CodeValue();
-    }
-
     if (SpecialMenu) {
       RenderSpecialMenu(selectedNumber);
     } else if (selectedNumber <= currentFileList.count()) {