[ruby-core:112129] [Ruby master Bug#19389] StringIO gets(..., chomp: true) behaves differently to File/IO.

Issue #19389 has been updated by naruse (Yui NARUSE).

Backport changed from 2.7: REQUIRED, 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED to 2.7: REQUIRED, 3.0: REQUIRED, 3.1: REQUIRED, 3.2: DONE

ruby_3_2 1689d8bb4843f92c1805e4a4bdd94049569198f4 merged revision(s) 21dced8b01823a991829b66ffdc8ffc635965c76.

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Bug #19389: StringIO gets(..., chomp: true) behaves differently to File/IO.
https://bugs.ruby-lang.org/issues/19389#change-101565

* Author: ioquatix (Samuel Williams)
* Status: Closed
* Priority: Normal
* Backport: 2.7: REQUIRED, 3.0: REQUIRED, 3.1: REQUIRED, 3.2: DONE
----------------------------------------
It seems like `StringIO` and `File` `#gets(..., chomp: true)` have different behaviour.

```
irb(main):003:0> io = StringIO.new("foo\r\nbar\r\n\r\n")
=> #<StringIO:0x00000001077e2018>
irb(main):004:0> io.gets("\r\n", chomp: true)
=> "foo"
irb(main):005:0> io.gets("\r\n", chomp: true)
=> "bar"
irb(main):006:0> io.gets("\r\n", chomp: true)
=> "\r\n"
```

compared with File:

```
irb(main):008:0> io = Tempfile.new
=> #<File:/var/folders/cm/p8lkj40s0vz_vgx_b5df9dkm0000gn/T/20230128-37714-107ims>
irb(main):009:0> io.write("foo\r\nbar\r\n\r\n")
=> 12
irb(main):012:0> io.rewind
=> 0
irb(main):013:0> io.gets("\r\n", chomp: true)
=> "foo"
irb(main):014:0> io.gets("\r\n", chomp: true)
=> "bar"
irb(main):015:0> io.gets("\r\n", chomp: true)
=> ""
```



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