fix: allow-one-hash-in-raw-strings option of needless_raw_string_hashes was ignored

Fixes: rust-lang/rust-clippy#11481

changelog: Fix `allow-one-hash-in-raw-strings` option of [`needless_raw_string_hashes`] was ignored

Author: krtab

src/tools/clippy/clippy_lints/src/raw_strings.rs

@@ -108,7 +108,7 @@ impl EarlyLintPass for RawStrings {
                 }
             }
 
-            let req = {
+            let mut req = {
                 let mut following_quote = false;
                 let mut req = 0;
                 // `once` so a raw string ending in hashes is still checked
@@ -136,7 +136,9 @@ impl EarlyLintPass for RawStrings {
                     ControlFlow::Continue(num) | ControlFlow::Break(num) => num,
                 }
             };
-
+            if self.allow_one_hash_in_raw_strings {
+                req = req.max(1);
+            }
             if req < max {
                 span_lint_and_then(
                     cx,

src/tools/clippy/tests/ui-toml/needless_raw_string_hashes_one_allowed/clippy.toml

@@ -0,0 +1 @@
+allow-one-hash-in-raw-strings = true

src/tools/clippy/tests/ui-toml/needless_raw_string_hashes_one_allowed/needless_raw_string_hashes.fixed

@@ -0,0 +1,9 @@
+#![allow(clippy::no_effect, unused)]
+#![warn(clippy::needless_raw_string_hashes)]
+
+fn main() {
+    r#"\aaa"#;
+    r#"\aaa"#;
+    r#"Hello "world"!"#;
+    r####" "### "## "# "####;
+}

src/tools/clippy/tests/ui-toml/needless_raw_string_hashes_one_allowed/needless_raw_string_hashes.rs

@@ -0,0 +1,9 @@
+#![allow(clippy::no_effect, unused)]
+#![warn(clippy::needless_raw_string_hashes)]
+
+fn main() {
+    r#"\aaa"#;
+    r##"\aaa"##;
+    r##"Hello "world"!"##;
+    r######" "### "## "# "######;
+}

src/tools/clippy/tests/ui-toml/needless_raw_string_hashes_one_allowed/needless_raw_string_hashes.stderr

@@ -0,0 +1,40 @@
+error: unnecessary hashes around raw string literal
+  --> $DIR/needless_raw_string_hashes.rs:6:5
+   |
+LL |     r##"\aaa"##;
+   |     ^^^^^^^^^^^
+   |
+   = note: `-D clippy::needless-raw-string-hashes` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::needless_raw_string_hashes)]`
+help: remove one hash from both sides of the string literal
+   |
+LL -     r##"\aaa"##;
+LL +     r#"\aaa"#;
+   |
+
+error: unnecessary hashes around raw string literal
+  --> $DIR/needless_raw_string_hashes.rs:7:5
+   |
+LL |     r##"Hello "world"!"##;
+   |     ^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove one hash from both sides of the string literal
+   |
+LL -     r##"Hello "world"!"##;
+LL +     r#"Hello "world"!"#;
+   |
+
+error: unnecessary hashes around raw string literal
+  --> $DIR/needless_raw_string_hashes.rs:8:5
+   |
+LL |     r######" "### "## "# "######;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove 2 hashes from both sides of the string literal
+   |
+LL -     r######" "### "## "# "######;
+LL +     r####" "### "## "# "####;
+   |
+
+error: aborting due to 3 previous errors
+