Prefer light_rewrite_comment if it is not a doccomment (rust-lang#5536)

Fixes 5533, 5568, 5907

Prevent `format_code_in_doc_comments=true` from affecting how non-doc comments are formatted.


---------

Co-authored-by: Yacin Tmimi <yacintmimi@gmail.com>

Author: pan93412

src/comment.rs

@@ -365,7 +365,11 @@ fn identify_comment(
             trim_left_preserve_layout(first_group, shape.indent, config)?
         } else if !config.normalize_comments()
             && !config.wrap_comments()
-            && !config.format_code_in_doc_comments()
+            && !(
+                // `format_code_in_doc_comments` should only take effect on doc comments,
+                // so we only consider it when this comment block is a doc comment block.
+                is_doc_comment && config.format_code_in_doc_comments()
+            )
         {
             light_rewrite_comment(first_group, shape.indent, config, is_doc_comment)
         } else {

tests/target/issue-5568.rs

@@ -0,0 +1,14 @@
+// rustfmt-max_width: 119
+// rustfmt-format_code_in_doc_comments: true
+
+mod libs {
+    fn mrbgems_sources() {
+        [
+            "mrbgems/mruby-compiler/core/codegen.c", // Ruby parser and bytecode generation
+            "mrbgems/mruby-compiler/core/y.tab.c",   // Ruby parser and bytecode generation
+            "mrbgems/mruby-metaprog/src/metaprog.c", // APIs on Kernel and Module for accessing classes and variables
+            "mrbgems/mruby-method/src/method.c",     // `Method`, `UnboundMethod`, and method APIs on Kernel and Module
+            "mrbgems/mruby-pack/src/pack.c",         // Array#pack and String#unpack
+        ]
+    }
+}

tests/target/issue_5533.rs

@@ -0,0 +1,6 @@
+// rustfmt-format_code_in_doc_comments: true
+
+struct TestStruct {
+    position_currency: String, // Currency for position of this contract. If not null, 1 contract = 1 positionCurrency.
+    pu: Option<i64>, // Previous event update sequense ("u" of previous message), -1 also means None
+}

tests/target/issue_5907.rs

@@ -0,0 +1,6 @@
+// rustfmt-format_code_in_doc_comments: true
+
+// ```
+// [
+// ]
+// ```