Merge #11311

11311: fix: insert auto-imports after header comments r=repnop a=repnop

Fixes #8607.

This commit changes the auto-import functionality and causes it to add imports after any leading comments, which are commonly license headers. This does not affect comments on items as they're considered part of the item itself and not separate.

Co-authored-by: Wesley Norris <repnop@outlook.com>

crates/ide_db/src/helpers/insert_use.rs

@@ -401,7 +401,7 @@ fn insert_use_(
         .children_with_tokens()
         .filter(|child| match child {
             NodeOrToken::Node(node) => is_inner_attribute(node.clone()),
-            NodeOrToken::Token(token) => is_inner_comment(token.clone()),
+            NodeOrToken::Token(token) => is_comment(token.clone()),
         })
         .last()
     {
@@ -440,7 +440,6 @@ fn is_inner_attribute(node: SyntaxNode) -> bool {
     ast::Attr::cast(node).map(|attr| attr.kind()) == Some(ast::AttrKind::Inner)
 }
 
-fn is_inner_comment(token: SyntaxToken) -> bool {
-    ast::Comment::cast(token).and_then(|comment| comment.kind().doc)
-        == Some(ast::CommentPlacement::Inner)
+fn is_comment(token: SyntaxToken) -> bool {
+    ast::Comment::cast(token).is_some()
 }

crates/ide_db/src/helpers/insert_use/tests.rs

@@ -390,6 +390,62 @@ use foo::bar::Baz;"#,
     );
 }
 
+#[test]
+fn inserts_after_single_line_comments() {
+    check_none(
+        "foo::bar::Baz",
+        "// Represents a possible license header and/or general module comments",
+        r#"// Represents a possible license header and/or general module comments
+
+use foo::bar::Baz;"#,
+    );
+}
+
+#[test]
+fn inserts_after_multiple_single_line_comments() {
+    check_none(
+        "foo::bar::Baz",
+        "// Represents a possible license header and/or general module comments
+// Second single-line comment
+// Third single-line comment",
+        r#"// Represents a possible license header and/or general module comments
+// Second single-line comment
+// Third single-line comment
+
+use foo::bar::Baz;"#,
+    );
+}
+
+#[test]
+fn inserts_before_single_line_item_comments() {
+    check_none(
+        "foo::bar::Baz",
+        r#"// Represents a comment about a function
+fn foo() {}"#,
+        r#"use foo::bar::Baz;
+
+// Represents a comment about a function
+fn foo() {}"#,
+    );
+}
+
+#[test]
+fn inserts_after_single_line_header_comments_and_before_item() {
+    check_none(
+        "foo::bar::Baz",
+        r#"// Represents a possible license header
+// Line two of possible license header
+
+fn foo() {}"#,
+        r#"// Represents a possible license header
+// Line two of possible license header
+
+use foo::bar::Baz;
+
+fn foo() {}"#,
+    );
+}
+
 #[test]
 fn inserts_after_multiline_inner_comments() {
     check_none(