(https://github.com/ruby/reline/pull/604)

* Fallback to 256color if COLORTERM != truecolor

* Add Reline::Face.force_truecolor to force truecolor without COLORTERM env

https://github.com/ruby/reline/commit/090e1e4df0

character attributes
(https://github.com/ruby/reline/pull/552)

* Reine::Face

* fix test_yamatanooroti

* Define singleton methods to make accessors to attributes of a face

* s/display/foreground/

* s/default/default_style/ && s/normal_line/default/ && s/enhanced_line/enhanced/

* fix typo

* FaceConfig.new now takes keyword arguments

* Update lib/reline/face.rb

Co-authored-by: Stan Lo <stan001212@gmail.com>

* Update test/reline/test_face.rb

Co-authored-by: Stan Lo <stan001212@gmail.com>

* Fix to correspond to frozen_string_literal

* Face::FaceConfig -> Face::Config

* ref https://github.com/ruby/reline/pull/552#pullrequestreview-1677282576

* delete unused ivar

* ref https://github.com/ruby/reline/pull/552#discussion_r1358783723

* insert "\e[0m" into all SGR

* tiny fix

* ESSENTIAL_DEFINE_NAMES

ref https://github.com/ruby/reline/pull/552#discussion_r1367722247

* Change to Hash-accessor style

- Reline::Face[:completion_dialog].enhanced ->
  Reline::Face[:completion_dialog][:enhanced]
- Reline::Face.configs shows all defined values

* Cache array method call in local variable

* Tests for Face configuration variations

* resolve https://github.com/ruby/reline/pull/552#pullrequestreview-1710938154

* amend  to

* check invalid SGR parameter in :style

* The order of define values should be preserved

* Update test/reline/test_face.rb

Co-authored-by: Stan Lo <stan001212@gmail.com>

* Update test/reline/test_face.rb

Co-authored-by: Stan Lo <stan001212@gmail.com>

* Add methods: load_initial_config and reset_to_initial_config. And teardown in tests

* omission in amending "style: :default" to "style: :reset"

* refs https://github.com/ruby/reline/issues/598

* Fix link

* amend method name

* Update lib/reline/face.rb

Co-authored-by: ima1zumi <52617472+ima1zumi@users.noreply.github.com>

---------

https://github.com/ruby/reline/commit/fdc1d3b1e5

Co-authored-by: Stan Lo <stan001212@gmail.com>
Co-authored-by: ima1zumi <52617472+ima1zumi@users.noreply.github.com>