less aggressively use preceding node as last_child

crates/ruff_python_formatter/src/comments/placement.rs

@@ -716,7 +716,7 @@ fn handle_own_line_comment_after_branch<'a>(
     //     pass
     // ```
     //
-    // Otherwise, the preceding node is the last statement in the body
+    // Otherwise, the preceding node may be the last statement in the body
     // of the preceding branch, in which case we can take it as our
     // `last_child` here - e.g.
     //
@@ -728,7 +728,26 @@ fn handle_own_line_comment_after_branch<'a>(
     // else:
     //     pass
     // ```
-    let last_child = preceding.last_child_in_body().unwrap_or(preceding);
+    let last_child = match preceding.last_child_in_body() {
+        Some(last) => last,
+        None if matches!(
+            comment.enclosing_node(),
+            AnyNodeRef::StmtIf(_)
+                | AnyNodeRef::StmtWhile(_)
+                | AnyNodeRef::StmtFor(_)
+                | AnyNodeRef::StmtMatch(_)
+                | AnyNodeRef::ElifElseClause(_)
+                | AnyNodeRef::StmtTry(_)
+                | AnyNodeRef::MatchCase(_)
+                | AnyNodeRef::ExceptHandlerExceptHandler(_)
+        ) =>
+        {
+            preceding
+        }
+        _ => {
+            return CommentPlacement::Default(comment);
+        }
+    };
 
     // We only care about the length because indentations with mixed spaces and tabs are only valid if
     // the indent-level doesn't depend on the tab width (the indent level must be the same if the tab width is 1 or 8).