Fix namespace open placement by preserving original startLine - 1 logic

Copilot · T-Gro · Copilot · commit cd2861c4d20a · 2025-11-11T12:58:17.000Z
Co-authored-by: T-Gro &lt;46543583+T-Gro@users.noreply.github.com&gt;
diff --git a/src/Compiler/Service/ServiceParsedInputOps.fs b/src/Compiler/Service/ServiceParsedInputOps.fs
@@ -2447,8 +2447,8 @@ module ParsedInput =
                 // Use trivia to get the actual module/namespace keyword line, which excludes attributes
                 let startLine =
                     match trivia.LeadingKeyword with
-                    | SynModuleOrNamespaceLeadingKeyword.Module moduleRange
-                    | SynModuleOrNamespaceLeadingKeyword.Namespace moduleRange -> moduleRange.StartLine
+                    | SynModuleOrNamespaceLeadingKeyword.Module moduleRange -> moduleRange.StartLine
+                    | SynModuleOrNamespaceLeadingKeyword.Namespace namespaceRange -> namespaceRange.StartLine - 1
                     | SynModuleOrNamespaceLeadingKeyword.None ->
                         // No keyword (implicit module), use range.StartLine
                         if isModule then range.StartLine else range.StartLine - 1
