text: make justify_format() work on any buffer

The function assumes that it works on the current buffer by handling
'totsize' and the mark.  Remove this handling to make the function
more general, which is needed to make it undoable eventually.

This breaks the function somewhat.  Fixes for this are forthcoming.

src/text.c

@@ -1863,9 +1863,6 @@ void justify_format(filestruct *paragraph, size_t skip)
 {
 	char *end, *new_end, *new_paragraph_data;
 	size_t shift = 0;
-#ifndef NANO_TINY
-	size_t mark_shift = 0;
-#endif
 
 	end = paragraph->data + skip;
 	new_paragraph_data = charalloc(strlen(paragraph->data) + 1);
@@ -1889,13 +1886,6 @@ void justify_format(filestruct *paragraph, size_t skip)
 
 				end += end_len;
 				shift += end_len;
-
-#ifndef NANO_TINY
-				/* Keep track of the change in the current line. */
-				if (openfile->mark == paragraph &&
-						openfile->mark_x >= end - paragraph->data)
-					mark_shift += end_len;
-#endif
 			}
 		/* If this character is punctuation optionally followed by a
 		 * bracket and then followed by blanks, change no more than two
@@ -1943,13 +1933,6 @@ void justify_format(filestruct *paragraph, size_t skip)
 
 				end += end_len;
 				shift += end_len;
-
-#ifndef NANO_TINY
-				/* Keep track of the change in the current line. */
-				if (openfile->mark == paragraph &&
-						openfile->mark_x >= end - paragraph->data)
-					mark_shift += end_len;
-#endif
 			}
 		/* If this character is neither blank nor punctuation, leave it
 		 * unchanged. */
@@ -1974,20 +1957,9 @@ void justify_format(filestruct *paragraph, size_t skip)
 	}
 
 	if (shift > 0) {
-		openfile->totsize -= shift;
 		null_at(&new_paragraph_data, new_end - new_paragraph_data);
 		free(paragraph->data);
 		paragraph->data = new_paragraph_data;
-
-#ifndef NANO_TINY
-		/* Adjust the mark coordinates to compensate for the change in
-		 * the current line. */
-		if (openfile->mark == paragraph) {
-			openfile->mark_x -= mark_shift;
-			if (openfile->mark_x > new_end - new_paragraph_data)
-				openfile->mark_x = new_end - new_paragraph_data;
-		}
-#endif
 	} else
 		free(new_paragraph_data);
 }