[clang] [ClangFormat] Fix formatting bugs. (PR #76245)

[Owen Pan via cfe-commits]

================
@@ -255,6 +255,41 @@ TEST_F(FormatTestMacroExpansion,
                          Style);
 }
 
+TEST_F(FormatTestMacroExpansion, CommaAsOperator) {
+  FormatStyle Style = getGoogleStyle();
+  Style.ColumnLimit = 42;
+  Style.Macros.push_back("MACRO(a, b, c)=a=(b); if(x) c");
+  verifyFormat("MACRO(auto a,\n"
+               "      looooongfunction(first, second,\n"
+               "                       third),\n"
+               "      fourth);",
+               Style);
+}
+
+TEST_F(FormatTestMacroExpansion, ForcedBreakDiffers) {
+  FormatStyle Style = getGoogleStyle();
+  Style.ColumnLimit = 40;
+  Style.Macros.push_back("MACRO(a, b)=a=(b)");
+  verifyFormat("//\n"
+               "MACRO(const type variable,\n"
+               "      functtioncall(\n"
+               "          first, longsecondarg, third));\n",
----------------
owenca wrote:

```suggestion
               "          first, longsecondarg, third));",
```

https://github.com/llvm/llvm-project/pull/76245