[llvm-bugs] [Bug 48539] New: ReflowComments breaks Qt translation comments

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48539

            Bug ID: 48539
           Summary: ReflowComments breaks Qt translation comments
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jvapen at gmail.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

Qt has a concept of translation comments (see
https://doc.qt.io/qt-5/i18n-source-translation.html#translator-comments)
This gives extra meaning to //:, //=, //~.
This is a bit similar to doxygen using ///, ///<, //! or //!<

When reflown and a part of the comments are added on a new line, it should
repeat these extra characters as part of the comment token.

The reproduction:

.clang-format
=============
ColumnLimit:     40
ReflowComments:  true

example.cpp
===========
//: This is a test. AAAAAAAAAA AAAAAAAAA AAAAAAAAAAAAAAA
QString example = tr("Example");

result.cpp
==========
//: This is a test. AAAAAAAAAA AAAAAAAAA
//AAAAAAAAAAAAAAA
QString example = tr("Example");

expected.cpp
============
//: This is a test. AAAAAAAAAA AAAAAAAAA
//: AAAAAAAAAAAAAAA
QString example = tr("Example");

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