refactor(renderer): Extract more DecorStyle style

Author: epage

src/renderer/mod.rs

@@ -2403,11 +2403,7 @@ impl Renderer {
         col: usize,
         is_cont: bool,
     ) {
-        let chr = match self.decor_style {
-            DecorStyle::Ascii => "= ",
-            DecorStyle::Unicode if is_cont => "├ ",
-            DecorStyle::Unicode => "╰ ",
-        };
+        let chr = self.decor_style.note_separator(is_cont);
         buffer.puts(line, col, chr, ElementStyle::LineNumber);
     }
 
@@ -2827,6 +2823,14 @@ impl DecorStyle {
         }
     }
 
+    fn note_separator(&self, is_cont: bool) -> &str {
+        match self {
+            DecorStyle::Ascii => "= ",
+            DecorStyle::Unicode if is_cont => "├ ",
+            DecorStyle::Unicode => "╰ ",
+        }
+    }
+
     fn multi_suggestion_separator(&self) -> &'static str {
         match self {
             DecorStyle::Ascii => "|",