Fix idempotency issue with raw strings

Author: shulaoda

src/comment.rs

@@ -1360,7 +1360,6 @@ where
                 match chr {
                     '"' => {
                         if sharps == 0 {
-                            char_kind = FullCodeCharKind::Normal;
                             CharClassesStatus::Normal
                         } else if is_raw_string_suffix(&mut self.base, sharps) {
                             CharClassesStatus::RawStringSuffix(sharps)

tests/source/issue-6161.rs

@@ -0,0 +1,8 @@
+fn f() {
+my_macro! {
+    m =>
+    "a": r"bb
+            ccc
+",
+};
+}

tests/target/issue-6161.rs

@@ -0,0 +1,8 @@
+fn f() {
+    my_macro! {
+        m =>
+        "a": r"bb
+            ccc
+",
+    };
+}