Fixes issue #1447 - Overlapping of long descriptions with values.

Marlin/dogm_lcd_implementation.h

@@ -51,7 +51,7 @@
 #endif
 */
 
-#define USE_BIG_EDIT_FONT
+#define USE_BIG_EDIT_FONT                // save 3120 bytes of PROGMEM by commenting out this line
 #define FONT_STATUSMENU u8g_font_6x9
 #define FONT_MENU u8g_font_6x10_marlin
 
@@ -375,11 +375,28 @@ static void _drawmenu_setting_edit_generic(uint8_t row, const char* pstr, char p
 #define lcd_implementation_drawmenu_setting_edit_callback_bool(row, pstr, pstr2, data, callback) lcd_implementation_drawmenu_setting_edit_generic_P(row, pstr, ' ', (*(data))?PSTR(MSG_ON):PSTR(MSG_OFF))
 
 void lcd_implementation_drawedit(const char* pstr, char* value) {
-  u8g.setPrintPos(0 * DOG_CHAR_WIDTH_EDIT, (u8g.getHeight() - 1 - DOG_CHAR_HEIGHT_EDIT) - (1 * DOG_CHAR_HEIGHT_EDIT) - START_ROW );
+  uint8_t rows = 1;
+  uint8_t lcd_width = LCD_WIDTH;
+  uint8_t char_width = DOG_CHAR_WIDTH;
+
+#ifdef USE_BIG_EDIT_FONT
+  if (strlen_P(pstr) <= LCD_WIDTH_EDIT - 1) {
     u8g.setFont(FONT_MENU_EDIT);
+    lcd_width = LCD_WIDTH_EDIT + 1;
+    char_width = DOG_CHAR_WIDTH_EDIT;
+    if (strlen_P(pstr) >= LCD_WIDTH_EDIT - strlen(value)) rows = 2;
+  }
+  else {
+    u8g.setFont(FONT_MENU);
+  }
+#endif
+
+  if ( strlen_P(pstr) > LCD_WIDTH - 2 - strlen(value) ) rows = 2;
+
+  u8g.setPrintPos(                                     0, u8g.getHeight() *  1/(1+rows) + DOG_CHAR_HEIGHT_EDIT/2); //1/(1+rows) = 1/2 or 1/3
   lcd_printPGM(pstr);
   u8g.print(':');
-  u8g.setPrintPos((14 - strlen(value)) * DOG_CHAR_WIDTH_EDIT, (u8g.getHeight() - 1 - DOG_CHAR_HEIGHT_EDIT) - (1 * DOG_CHAR_HEIGHT_EDIT) - START_ROW );
+  u8g.setPrintPos((lcd_width-1-strlen(value))*char_width, u8g.getHeight()*rows/(1+rows) + DOG_CHAR_HEIGHT_EDIT/2); //rows/(1+rows) = 1/2 or 2/3
   u8g.print(value);
 }