templater: ignore all ascii whitespace characters

Per Rust/WhatWG definition.
https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii_whitespace

src/template.pest

@@ -17,7 +17,7 @@
 // predecessors % ("predecessor: " ++ commit_id)
 // parents % (commit_id ++ " is a parent of " ++ super.commit_id)
 
-whitespace = _{ " " | "\t" | "\n" }
+whitespace = _{ " " | "\t" | "\r" | "\n" | "\x0c" }
 
 escape = @{ "\\" ~ ("t" | "r" | "n" | "\"" | "\\") }
 literal_char = @{ !("\"" | "\\") ~ ANY }

src/template_parser.rs

@@ -1245,6 +1245,17 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_parse_whitespace() {
+        let ascii_whitespaces: String = ('\x00'..='\x7f')
+            .filter(char::is_ascii_whitespace)
+            .collect();
+        assert_eq!(
+            parse_normalized(&format!("{ascii_whitespaces}f()")).unwrap(),
+            parse_normalized("f()").unwrap(),
+        );
+    }
+
     #[test]
     fn test_function_call_syntax() {
         // Trailing comma isn't allowed for empty argument