NFD

You may find violations in a repository with this script:

find -name '*.hpp' -or -name '*.cpp' -exec awk '
BEGIN {
  indent = "*"
}
indent != "*" {
  if (substr($0, 1, length(indent) + 3) == indent "  {") {
    print FILENAME " " (FNR - 1) " " lastline
    print FILENAME " " FNR " " $0
  }
  indent = "*"
}
$1 ~ /^(if|else|for|while|do|try)$/ {
  split($0, a, $1)
  indent = a[1]
  lastline = $0
}
' {} +

Junxiao Shi wrote:

GNU-style indentation of braces is not longer permitted in code-style.

That applies to new and updated code. It doesn't mean we need to actively "fix" all existing code.

Yes. #1403-2 mandates every touched file to conform to code style, but in the past the reviewer has asked to separate code style fixes into its own commit. This issue is created so that those commits have an issue to associate with.