[llvm-bugs] [Bug 49639] New: attach-braces after enum doesn't, unless allowshortenums is true

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49639

            Bug ID: 49639
           Summary: attach-braces after enum doesn't, unless
                    allowshortenums is true
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: adridg at FreeBSD.org
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

Reported by Luna on Twitter; she's stymied by the registration (e.g. real-name
requirements) for the bug tracker. I can reproduce the problem.

This is an issue *similar* to #46927 and possibly #37302; there are a couple
more attach-braces issues open as well. This is the input file:

```
enum EnumWithComma { A, B,
C,
};
enum EnumWithoutComma { A_, B_,
C_ };
struct Struct {
int a;
bool b;
} ;
```

When clang-format 11 (and 12, too) is used with **attached** braces and
*AllowShortEnumsOnASingleLine*, it attaches braces but enums with trailing
commas are somehow not "short".

```
$ clang-format11  --style="{Language: Cpp, BreakBeforeBraces: Attach,
AllowShortEnumsOnASingleLine: true}" example.cpp
enum EnumWithComma {
  A,
  B,
  C,
};
enum EnumWithoutComma { A_, B_, C_ };
struct Struct {
  int a;
  bool b;
};
```

When clang-format 11 (and 12, too) is used with **attached** braces but short
enums are not allowed on one line, it doesn't attach at all:

```
$ clang-format11  --style="{Language: Cpp, BreakBeforeBraces: Attach,
AllowShortEnumsOnASingleLine: false}" example.cpp 
enum EnumWithComma
{
  A,
  B,
  C,
};
enum EnumWithoutComma
{
  A_,
  B_,
  C_
};
struct Struct {
  int a;
  bool b;
};
```


PS. Probably #37302 and #21200 can be closed, as they refer to ancient versions
of clang-format and suitable configurations for brace-attachment and short
enums (except for this bug) are available now.

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