Display the file name even when there are no syntactic changes

CHANGELOG.md

@@ -23,6 +23,9 @@ only one column is shown, to maximise display usage.
 Difftastic now wraps rather than truncating lines that are too long
 for the terminal width.
 
+If a file has no syntactic changes, difftastic now shows the file name
+consistently with changed files.
+
 ### Command Line Interface
 
 The difftastic binary is now named `difft`, to reduce typing during

src/bin/difft.rs

@@ -256,6 +256,7 @@ fn diff_file(display_path: &str, lhs_path: &str, rhs_path: &str) {
     );
 
     if hunks.is_empty() {
+        println!("{}", style::header(display_path, 1, 1, lang_name));
         if lang_name == "text" {
             println!("No changes.\n");
         } else {