[llvm-bugs] [Bug 31909] New: formatter doesn't correctly count length of Unicode codepoints

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31909

            Bug ID: 31909
           Summary: formatter doesn't correctly count length of Unicode
                    codepoints
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dcheng at google.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org
    Classification: Unclassified

It looks like column count is based strictly on byte count, which means that
attempts to line up code on different rows fails when things like U+2026 are
involved.

Input:
#define MACRO() \
    int test; \
    // This is my test comment in a macro… This is my test comment in a macro…
\
    // This is my test comment in a macro. This is my test comment in a macro.

Output:
#define MACRO() \
  int test;     \
// This is my test comment in a macro… This is my test comment in a macro… \
    // This is my test comment in a macro. This is my test comment in a macro.

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