clang-format: Improve formatting of templated builder-type calls.

Before:
  aaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaa().aaaaaaaaaaaaaaaaa().has<
      bbbbbbbbbbbbbbbbbbbbb>();

After:
  aaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaa()
      .aaaaaaaaaaaaaaaaaaaaaaaaaa()
      .has<bbbbbbbbbbbbbbbbbbbbb>();

llvm-svn: 192981

clang/lib/Format/ContinuationIndenter.cpp

@@ -581,9 +581,12 @@ unsigned ContinuationIndenter::moveStateToNextToken(LineState &State,
                            Current.PackingKind == PPK_Inconclusive)));
     }
 
-    State.Stack.push_back(
-        ParenState(NewIndent, NewIndentLevel, State.Stack.back().LastSpace,
-                   AvoidBinPacking, State.Stack.back().NoLineBreak));
+    bool NoLineBreak = State.Stack.back().NoLineBreak ||
+                       (Current.Type == TT_TemplateOpener &&
+                        State.Stack.back().ContainsUnwrappedBuilder);
+    State.Stack.push_back(ParenState(NewIndent, NewIndentLevel,
+                                     State.Stack.back().LastSpace,
+                                     AvoidBinPacking, NoLineBreak));
     State.Stack.back().BreakBeforeParameter = Current.BlockKind == BK_Block;
     ++State.ParenLevel;
   }

clang/unittests/Format/FormatTest.cpp

@@ -3110,6 +3110,13 @@ TEST_F(FormatTest, FormatsBuilderPattern) {
                "    ->aaaaaaaaaaaaaae(0)\n"
                "    ->aaaaaaaaaaaaaaa();");
 
+  verifyFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaa()\n"
+               "    .aaaaaaaaaaaaaaaaaaaaaaaaaa()\n"
+               "    .has<bbbbbbbbbbbbbbbbbbbbb>();");
+  verifyFormat("aaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaa()\n"
+               "    .aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa<\n"
+               "         aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa>();");
+
   // Prefer not to break after empty parentheses.
   verifyFormat("FirstToken->WhitespaceRange.getBegin().getLocWithOffset(\n"
                "    First->LastNewlineOffset);");