[clang-format] Lambda hanging indent increased by moving to a new line

[rmarker]

There is behaviour to minimise the hanging indent with lambdas by moving them to a new line.
However, this can inadvertently increase the amount of hanging indent in particular circumstances.

For example, the following code with -style="{BreakBeforeBraces: Allman, AllowShortLambdasOnASingleLine: false, ContinuationIndentWidth: 8}"

if (
        []()
        {
          return true;
        }())
{
}

fun(
        []()
        {
          return 17;
        });

Expected:

if ([]()
    {
      return true;
    }())
{
}

fun([]()
    {
      return 17;
    });

[llvmbot]

@llvm/issue-subscribers-clang-format

Author: None (rmarker)

There is behaviour to minimise the hanging indent with lambdas by moving them to a new line. However, this can inadvertently increase the amount of hanging indent in particular circumstances.

For example, the following code with -style="{BreakBeforeBraces: Allman, AllowShortLambdasOnASingleLine: false, ContinuationIndentWidth: 8}"

if (
        []()
        {
          return true;
        }())
{
}

fun(
        []()
        {
          return 17;
        });

Expected:

if ([]()
    {
      return true;
    }())
{
}

fun([]()
    {
      return 17;
    });