clang-format: Fix regression introduced in r290084.

We still want to try in linewrap within single elements of a 1-column
list.

After:
  Type *Params[] = {PointerType::getUnqual(FunctionType::get(
			Builder.getVoidTy(), Builder.getInt8PtrTy(), false)),
		    Builder.getInt8PtrTy(),
		    Builder.getInt32Ty(),
		    LongType,
		    LongType,
		    LongType};

Before:
  No line break in the first element, so column limit violation.

llvm-svn: 290090

2 files changed, 9 insertions, 1 deletions

diff --git a/clang/lib/Format/FormatToken.cpp b/clang/lib/Format/FormatToken.cpp
index e0dfac7d4e1..b51f807ccc1 100644
--- a/clang/lib/Format/FormatToken.cpp
+++ b/clang/lib/Format/FormatToken.cpp
@@ -92,6 +92,14 @@ unsigned CommaSeparatedList::formatAfterToken(LineState &State,
 
   // Find the best ColumnFormat, i.e. the best number of columns to use.
   const ColumnFormat *Format = getColumnFormat(RemainingCodePoints);
+
+  // Formatting with 1 Column isn't really a column layout, so we don't need the
+  // special logic here. We can just avoid bin packing any of the parameters.
+  if (Format && Format->Columns == 1) {
+    State.Stack.back().AvoidBinPacking = true;
+    return 0;
+  }
+
   // If no ColumnFormat can be used, the braced list would generally be
   // bin-packed. Add a severe penalty to this so that column layouts are
   // preferred if possible.
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 70abf3af7d7..9c2c25d0910 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -6641,7 +6641,7 @@ TEST_F(FormatTest, LayoutCxx11BraceInitializers) {
       "std::this_thread::sleep_for(\n"
       "    std::chrono::nanoseconds{ std::chrono::seconds{ 1 } } / 5);",
       ExtraSpaces);
-  verifyFormat("std::vector<MyValues> aaaaaaaaaaaaaaaaaaa{\n"
+  verifyFormat("std::vector<MyValues> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa{\n"
                "    aaaaaaa,\n"
                "    aaaaaaaaaa,\n"
                "    aaaaa,\n"