[clang] [clang-format] Add new option: WrapNamespaceBodyWithNewlines (PR #106145)

[Owen Pan via cfe-commits]

================
@@ -1493,6 +1493,22 @@ static auto computeNewlines(const AnnotatedLine &Line,
     Newlines = 1;
   }
 
+  if (Style.WrapNamespaceBodyWithEmptyLines != FormatStyle::WNBWELS_Leave) {
+    // Modify empty lines after TT_NamespaceLBrace.
+    if (PreviousLine && PreviousLine->endsWith(TT_NamespaceLBrace)) {
+      if (Style.WrapNamespaceBodyWithEmptyLines == FormatStyle::WNBWELS_Never)
+        Newlines = 1;
+      else if (!Line.startsWithNamespace())
+        Newlines = std::max(Newlines, 2u);
+    }
+    // Modify empty lines before TT_NamespaceRBrace.
+    if (Line.startsWith(TT_NamespaceRBrace)) {
+      if (Style.WrapNamespaceBodyWithEmptyLines == FormatStyle::WNBWELS_Never)
+        Newlines = 1;
+      else if (!PreviousLine->startsWith(TT_NamespaceRBrace))
+        Newlines = std::max(Newlines, 2u);
+    }
+
----------------
owenca wrote:

```suggestion
  }

```
The missing '}' caused the compilation to fail.

https://github.com/llvm/llvm-project/pull/106145