clang-format: Improve heuristic around avoiding bad line breaks.

Now, this can be properly formatted:
  static_cast<A< //
      B> *>(     //
      );

Before, clang-format could end up, not formatting the code at all.

llvm-svn: 213055

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 81b233c2f54..2ac017c6f59 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -4467,6 +4467,14 @@ TEST_F(FormatTest, WrapsTemplateDeclarations) {
       "                      aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa>(\n"
       "        bbbbbbbbbbbbbbbbbbbbbbbb);",
       getLLVMStyleWithColumns(72));
+  EXPECT_EQ("static_cast<A< //\n"
+            "    B> *>(\n"
+            "\n"
+            "    );",
+            format("static_cast<A<//\n"
+                   "    B>*>(\n"
+                   "\n"
+                   "    );"));
 
   FormatStyle AlwaysBreak = getLLVMStyle();
   AlwaysBreak.AlwaysBreakTemplateDeclarations = true;