Fix for corner cases in code handling leading "* " decorations in block comments

Summary:
Fixes problems that lead to incorrect formatting of these and similar snippets:
/*
 **
 */

/*
 **/

/*
 * */

/*
 *test
 */

Clang-format used to think that all the cases above use "* " decoration, and
failed to calculate insertion position properly. It also used to remove leading 
"* " in the last line.

Reviewers: klimek

Reviewed By: klimek

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1113

llvm-svn: 185818

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/Format/BreakableToken.h b/clang/lib/Format/BreakableToken.h
index 9dab473d8a8..afcc8b83a53 100644
--- a/clang/lib/Format/BreakableToken.h
+++ b/clang/lib/Format/BreakableToken.h
@@ -208,6 +208,10 @@ private:
   // instead.
   unsigned IndentAtLineBreak;
 
+  // This is to distinguish between the case when the last line was empty and
+  // the case when it started with a decoration ("*" or "* ").
+  bool LastLineNeedsDecoration;
+
   // Either "* " if all lines begin with a "*", or empty.
   StringRef Decoration;
 };