[clang] [clang-format] Propagate `LeadingEmptyLinesAffected` when joining lines (PR #146761)

[Owen Pan via cfe-commits]

================
@@ -986,7 +986,7 @@ class LineJoiner {
   void join(AnnotatedLine &A, const AnnotatedLine &B) {
     assert(!A.Last->Next);
     assert(!B.First->Previous);
-    if (B.Affected)
+    if (B.Affected || (B.LeadingEmptyLinesAffected && 
A.Last->Children.empty()))
----------------
owenca wrote:

Can you add a test case for `A.Last->Children.empty()` being false?

https://github.com/llvm/llvm-project/pull/146761
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