Wrong indent in nomultiline mode

[tompng]

Description

In nomultiline mode, indent is +2 larger than expected when the previous line ends with do { (.

[tomoya:irb]% bin/console --nomultiline
irb(main):001:0> tap do
irb(main):002:1*     1
irb(main):003:1>   2
irb(main):004:1>   tap {
irb(main):005:2*       3
irb(main):006:2>     4
irb(main):007:2>     (
irb(main):008:3*         5
irb(main):009:3>       6

Result of irb_info

irb(main):001:0> irb_info
=> 
Ruby version: 3.2.0
IRB version: irb 1.6.2 (2022-12-13)
InputMethod: ReadlineInputMethod with ext/readline 8.2
RUBY_PLATFORM: x86_64-darwin20
LANG env: ja_JP.UTF-8
East Asian Ambiguous Width: 1

Terminal Emulator

Mac Terminal.app

Setting Files

Are you using ~/.irbrc and ~/.inputrc?
No