tweaks: rename a constant, to match what it actually means

Wrapping is concerned with columns, not with number of characters.

src/global.c

@@ -80,10 +80,8 @@ int shiftaltleft, shiftaltright, shiftaltup, shiftaltdown;
 #ifdef ENABLED_WRAPORJUSTIFY
 ssize_t fill = 0;
 		/* The column where we will wrap lines. */
-ssize_t wrap_at = -CHARS_FROM_EOL;
+ssize_t wrap_at = -COLUMNS_FROM_EOL;
-		/* The position where we will wrap lines.  fill is equal to this
+		/* The column where we will wrap lines. */
-		 * if it's greater than zero, and equal to (COLS + this) if it
-		 * isn't. */
 #endif
 
 char *last_search = NULL;

src/nano.h

@@ -630,9 +630,8 @@ enum
 /* The maximum number of entries displayed in the main shortcut list. */
 #define MAIN_VISIBLE (((COLS + 40) / 20) * 2)
 
-/* The default number of characters from the end of the line where
+/* The default number of columns from end of line where wrapping occurs. */
- * wrapping occurs. */
+#define COLUMNS_FROM_EOL 8
-#define CHARS_FROM_EOL 8
 
 /* The default width of a tab in spaces. */
 #define WIDTH_OF_TAB 8

src/rcfile.c

@@ -1105,7 +1105,7 @@ void parse_rcfile(FILE *rcstream, bool syntax_only)
 			if (!parse_num(option, &wrap_at)) {
 				rcfile_error(N_("Requested fill size \"%s\" is invalid"),
 								option);
-				wrap_at = -CHARS_FROM_EOL;
+				wrap_at = -COLUMNS_FROM_EOL;
 			} else
 				UNSET(NO_WRAP);
 			free(option);