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

[via cfe-commits]

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@@ -28104,6 +28104,251 @@ TEST_F(FormatTest, BreakBinaryOperations) {
                Style);
 }
 
+TEST_F(FormatTest, WrapNamespaceBodyWithEmptyLinesNever) {
+  FormatStyle Style = getLLVMStyle();
+  Style.FixNamespaceComments = false;
+  Style.ShortNamespaceLines = 0;
+  Style.MaxEmptyLinesToKeep = 2;
+  Style.WrapNamespaceBodyWithEmptyLines = FormatStyle::WNBWELS_Never;
+  Style.CompactNamespaces = false;
+
+  // Empty namespace
+  verifyNoChange("namespace N {};", Style);
+
+  // Single namespace
+  verifyNoChange("namespace N {\n"
+                 "int f1(int a) { return 2 * a; }\n"
+                 "};",
+                 Style);
+
+  // Nested namespace
+  verifyNoChange("namespace N1 {\n"
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dmasloff wrote:

Used `verifyNoChange` because `verifyFormat` has a strange behaviour with newlines and for no reasons tests were failing with it even though compiled `clang-format` with the same config formatted code exactly as I expected it. Also my option is quite interconnected with `MaxEmptyLinesToKeep`, whose behaviour is mostly tested with `verifyNoChange` and it works as expected

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