refactor: Rename variable

	The fold chaining is to find max line number rather than line number width

Author: chengr4

src/renderer/display_list.rs

@@ -72,18 +72,18 @@ impl<'a> fmt::Debug for DisplayList<'a> {
 
 impl<'a> Display for DisplayList<'a> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let lineno_width = self.body.iter().fold(0, |max, set| {
+        let max_lineno = self.body.iter().fold(0, |max, set| {
             set.display_lines.iter().fold(max, |max, line| match line {
                 DisplayLine::Source { lineno, .. } => cmp::max(lineno.unwrap_or(0), max),
                 _ => max,
             })
         });
-        let lineno_width = if lineno_width == 0 {
-            lineno_width + 1
+        let lineno_width = if max_lineno == 0 {
+            1
         } else if self.anonymized_line_numbers {
             ANONYMIZED_LINE_NUM.len()
         } else {
-            ((lineno_width as f64).log10().floor() as usize) + 1
+            ((max_lineno as f64).log10().floor() as usize) + 1
         };
 
         let multiline_depth = self.body.iter().fold(0, |max, set| {