Fixed ByteStr not padding within its Display trait when no specific alignment is mentioned

library/core/src/bstr/mod.rs

@@ -184,17 +184,24 @@ impl fmt::Display for ByteStr {
             Ok(())
         }
 
-        let Some(align) = f.align() else {
-            return fmt_nopad(self, f);
-        };
         let nchars: usize = self
             .utf8_chunks()
             .map(|chunk| {
                 chunk.valid().chars().count() + if chunk.invalid().is_empty() { 0 } else { 1 }
             })
             .sum();
+
         let padding = f.width().unwrap_or(0).saturating_sub(nchars);
         let fill = f.fill();
+
+        let Some(align) = f.align() else {
+            fmt_nopad(self, f)?;
+            for _ in 0..padding {
+                write!(f, "{fill}")?;
+            }
+            return Ok(());
+        };
+
         let (lpad, rpad) = match align {
             fmt::Alignment::Left => (0, padding),
             fmt::Alignment::Right => (padding, 0),

library/std/tests/path.rs

@@ -2291,6 +2291,26 @@ fn display_format_flags() {
     assert_eq!(format!("a{:#<5}b", Path::new("a").display()), "aa####b");
 }
 
+#[test]
+fn display_path_with_padding_no_align() {
+    assert_eq!(format!("{:10}", Path::new("/foo/bar").display()), "/foo/bar  ");
+}
+
+#[test]
+fn display_path_with_padding_align_left() {
+    assert_eq!(format!("{:<10}", Path::new("/foo/bar").display()), "/foo/bar  ");
+}
+
+#[test]
+fn display_path_with_padding_align_right() {
+    assert_eq!(format!("{:>10}", Path::new("/foo/bar").display()), "  /foo/bar");
+}
+
+#[test]
+fn display_path_with_padding_align_center() {
+    assert_eq!(format!("{:^10}", Path::new("/foo/bar").display()), " /foo/bar ");
+}
+
 #[test]
 fn into_rc() {
     let orig = "hello/world";