[clang-format] Don't reflow across comment pragmas.
Summary:
The comment reflower wasn't taking comment pragmas as reflow stoppers. This patch fixes that.
source:
```
// long long long long
// IWYU pragma:
```
format with column limit = 20 before:
```
// long long long
// long IWYU pragma:
```
format with column limit = 20 after:
```
// long long long
// long
// IWYU pragma:
```
Reviewers: djasper
Reviewed By: djasper
Subscribers: cfe-commits, klimek
Differential Revision: https://reviews.llvm.org/D29450
llvm-svn: 293898
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 1f81f5f..d9f56e3 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -2370,6 +2370,22 @@
"// XXX: long",
getLLVMStyleWithColumns(20)));
+ // Don't reflow comment pragmas.
+ EXPECT_EQ("// long long long\n"
+ "// long\n"
+ "// IWYU pragma:",
+ format("// long long long long\n"
+ "// IWYU pragma:",
+ getLLVMStyleWithColumns(20)));
+ EXPECT_EQ("/* long long long\n"
+ " * long\n"
+ " * IWYU pragma:\n"
+ " */",
+ format("/* long long long long\n"
+ " * IWYU pragma:\n"
+ " */",
+ getLLVMStyleWithColumns(20)));
+
// Reflow lines that have a non-punctuation character among their first 2
// characters.
EXPECT_EQ("// long long long\n"