[clang-format] Fix indent of trailing raw string param after newline

Summary:
Currently clang-format uses ContinuationIndent to indent the contents of a raw
string literal that is the last parameter of the function call. This is to
achieve formatting similar to trailing:
```
f(1, 2, R"pb(
    x: y)pb");
```
However this had the unfortunate consequence of producing format like this:
```
fffffff(1, 2,
        R"pb(
    a: b
        )pb");
```

This patch makes clang-format consider indenting a trailing raw string param
after a newline based off the start of the format delimiter, producing:
```
fffffff(1, 2,
        R"pb(
          a: b
        )pb");
```

Reviewers: djasper

Reviewed By: djasper

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D60558

llvm-svn: 358689

1 files changed, 14 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTestRawStrings.cpp b/clang/unittests/Format/FormatTestRawStrings.cpp
index 04b53c5ab39..dc2f6b51807 100644
--- a/clang/unittests/Format/FormatTestRawStrings.cpp
+++ b/clang/unittests/Format/FormatTestRawStrings.cpp
@@ -981,6 +981,20 @@ int f() {
 })test", Style));
 }
 
+TEST_F(FormatTestRawStrings, IndentsLastParamAfterNewline) {
+  FormatStyle Style = getRawStringPbStyleWithColumns(60);
+  expect_eq(R"test(
+fffffffffffffffffffff("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+                      R"pb(
+                        b: c
+                      )pb");)test",
+            format(R"test(
+fffffffffffffffffffff("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+                      R"pb(
+                      b: c
+                      )pb");)test",
+                   Style));
+}
 } // end namespace
 } // end namespace format
 } // end namespace clang