[clang-format] Fix comment indentation in text protos

[krasimir]

Summary

This patch fixes a bug where the comment indent of comments in text protos gets messed up because by default paren states get created with AlignColons = true (which makes snese for ObjC).

lib/Format/ContinuationIndenter.cpp

LineState ContinuationIndenter::getInitialState(unsigned FirstIndent,
   State.LowestLevelOnLine = 0;
   State.IgnoreStackForComparison = false;
 
   if (Style.Language == FormatStyle::LK_TextProto) {
     // We need this in order to deal with the bin packing of text fields at
     // global scope.
     State.Stack.back().AvoidBinPacking = true;
     State.Stack.back().BreakBeforeParameter = true;
+    State.Stack.back().AlignColons = false;
   }
 
   // The first token has already been indented and thus consumed.
   moveStateToNextToken(State, DryRun, /*Newline=*/false);
   return State;
 }
 
 bool ContinuationIndenter::canBreak(const LineState &State) {

unittests/Format/FormatTestTextProto.cpp

 }
 
 TEST_F(FormatTestTextProto, KeepsLongStringLiteralsOnSameLine) {
   verifyFormat(
       "foo: {\n"
       "  text: \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasaaaaaaaaaa\"\n"
       "}");
 }
+
+TEST_F(FormatTestTextProto, KeepsCommentsIndentedInList) {
+  verifyFormat("aaaaaaaaaa: 100\n"
+               "bbbbbbbbbbbbbbbbbbbbbbbbbbb: 200\n"
+               "# Single line comment for stuff here.\n"
+               "cccccccccccccccccccccccc: 3849\n"
+               "# Multiline comment for stuff here.\n"
+               "# Multiline comment for stuff here.\n"
+               "# Multiline comment for stuff here.\n"
+               "cccccccccccccccccccccccc: 3849");
+}
+
 } // end namespace tooling
 } // end namespace clang