Improve editing, fix some small value editing

Marlin/src/core/utility.cpp

@@ -161,6 +161,18 @@ void safe_delay(millis_t ms) {
     return &conv[3];
   }
 
+  // Convert signed float to fixed-length string with 12.34 / -2.34 format or 123.45 / -23.45 format
+  char* ftostr42_52(const float &f) {
+    if (f <= -10 || f >= 100) return ftostr52(f); // need more digits
+    long i = (f * 1000 + (f < 0 ? -5: 5)) / 10;
+    conv[2] = (f >= 0 && f < 10) ? ' ' : MINUSOR(i, DIGIMOD(i, 1000));
+    conv[3] = DIGIMOD(i, 100);
+    conv[4] = '.';
+    conv[5] = DIGIMOD(i, 10);
+    conv[6] = DIGIMOD(i, 1);
+    return &conv[2];
+  }
+
   // Convert signed float to fixed-length string with 023.45 / -23.45 format
   char* ftostr52(const float &f) {
     long i = (f * 1000 + (f < 0 ? -5: 5)) / 10;

Marlin/src/core/utility.h

@@ -82,6 +82,9 @@ inline void serial_delay(const millis_t ms) {
   // Convert unsigned float to string with 1.23 format
   char* ftostr12ns(const float &x);
 
+  // Convert signed float to fixed-length string with 12.34 / -2.34 or 023.45 / -23.45 format
+  char* ftostr42_52(const float &x);
+
   // Convert signed float to fixed-length string with 023.45 / -23.45 format
   char* ftostr52(const float &x);
 

Marlin/src/lcd/dogm/ultralcd_DOGM.cpp

@@ -418,7 +418,7 @@ void MarlinUI::clear_lcd() { } // Automatically cleared by Picture Loop
         onpage = PAGE_CONTAINS(baseline - (EDIT_FONT_ASCENT - 1), baseline);
       }
       if (onpage) {
-        lcd_moveto(((lcd_chr_fit - 1) - (vallen + 1)) * one_chr_width, baseline); // Right-justified, leaving padded by spaces
+        lcd_moveto((lcd_chr_fit - (vallen + 1)) * one_chr_width, baseline); // Right-justified, leaving padded by spaces
         lcd_put_wchar(' '); // overwrite char if value gets shorter
         lcd_put_u8str(value);
       }

Marlin/src/lcd/menu/menu.h

@@ -53,7 +53,7 @@ DECLARE_MENU_EDIT_TYPE(uint8_t,  uint8,       ui8tostr3,       1     );   // 123
 DECLARE_MENU_EDIT_TYPE(uint16_t, uint16_3,    ui16tostr3,      1     );   // 123, -12   right-justified
 DECLARE_MENU_EDIT_TYPE(uint16_t, uint16_4,    ui16tostr4,      0.1   );   // 1234, -123 right-justified
 DECLARE_MENU_EDIT_TYPE(float,    float3,      ftostr3,         1     );   // 123        right-justified
-DECLARE_MENU_EDIT_TYPE(float,    float52,     ftostr52,      100     );   // 123.45, -23.45
+DECLARE_MENU_EDIT_TYPE(float,    float52,     ftostr42_52,   100     );   // _2.34, 12.34, -2.34 or 123.45, -23.45
 DECLARE_MENU_EDIT_TYPE(float,    float43,     ftostr43sign, 1000     );   // 1.234
 DECLARE_MENU_EDIT_TYPE(float,    float5,      ftostr5rj,       0.01f );   // 12345      right-justified
 DECLARE_MENU_EDIT_TYPE(float,    float5_25,   ftostr5rj,       0.04f );   // 12345      right-justified (25 increment)
@@ -123,7 +123,7 @@ DEFINE_DRAW_MENU_ITEM_SETTING_EDIT(uint8);            // 123        right-justif
 DEFINE_DRAW_MENU_ITEM_SETTING_EDIT(uint16_3);         // 123, -12   right-justified
 DEFINE_DRAW_MENU_ITEM_SETTING_EDIT(uint16_4);         // 1234, -123 right-justified
 DEFINE_DRAW_MENU_ITEM_SETTING_EDIT(float3);           // 123        right-justified
-DEFINE_DRAW_MENU_ITEM_SETTING_EDIT(float52);          // 123.45, -23.45
+DEFINE_DRAW_MENU_ITEM_SETTING_EDIT(float52);          // _2.34, 12.34, -2.34 or 123.45, -23.45
 DEFINE_DRAW_MENU_ITEM_SETTING_EDIT(float43);          // 1.234
 DEFINE_DRAW_MENU_ITEM_SETTING_EDIT(float5);           // 12345      right-justified
 DEFINE_DRAW_MENU_ITEM_SETTING_EDIT(float5_25);        // 12345      right-justified (25 increment)