fix the mistake of overriding mode

a non-searching mode can override non-searching mode.
It’s likely just a mistake or typo :
if !matches!(*self, Mode::Search(_));
it should be：
if !matches!(new, Mode::Search(_))

crates/core/flags/defs.rs

@@ -2442,14 +2442,15 @@ fn test_generate() {
             .unwrap();
     assert_eq!(Mode::Generate(GenerateMode::Man), args.mode);
 
-    let args = parse_low_raw(["--generate", "man", "-l"]).unwrap();
-    assert_eq!(Mode::Search(SearchMode::FilesWithMatches), args.mode);
+    let args = parse_low_raw(["-l", "--generate", "man"]).unwrap();
+    assert_eq!(Mode::Generate(GenerateMode::Man), args.mode);
+
+    let args = parse_low_raw(["--generate", "man", "--files"]).unwrap();
+    assert_eq!(Mode::Files, args.mode);
 
-    // An interesting quirk of how the modes override each other that lets
-    // you get back to the "default" mode of searching.
     let args =
         parse_low_raw(["--generate", "man", "--json", "--no-json"]).unwrap();
-    assert_eq!(Mode::Search(SearchMode::Standard), args.mode);
+    assert_eq!(Mode::Generate(GenerateMode::Man), args.mode);
 }
 
 /// -g/--glob
@@ -5658,6 +5659,10 @@ fn test_quiet() {
 
     let args = parse_low_raw(["-q", "--count-matches"]).unwrap();
     assert_eq!(true, args.quiet);
+
+    let args = parse_low_raw(["--files", "-l"]).unwrap();
+    dbg!(args.mode);
+    assert_eq!(Mode::Files, args.mode);
 }
 
 /// --regex-size-limit

crates/core/flags/lowargs.rs

@@ -181,7 +181,7 @@ impl Mode {
                 // Once we're in a non-search mode, other non-search modes
                 // can override it. But search modes cannot. So for example,
                 // `--files -l` will still be Mode::Files.
-                if !matches!(*self, Mode::Search(_)) {
+                if !matches!(new, Mode::Search(_)) {
                     *self = new;
                 }
             }