[Bug 1941981] [NEW] busybox ed jumps line on insert

[karlsebal]

Public bug reported:

Busybox‘s implementation of `ed` skips a line when inserting. It will
insert the first line before and all subsequent lines after the line
addressed.

gnu ed implementation behaves like expected:

```
$ ed
i
one
two
three
four
five
.
,p
one
two
three
four
five
1
one
i
ione
itwo
ithree
ifive
.
,p
ione
itwo
ithree
ifive
one
two
three
four
five
Q
```

The lines »ione« through »ifive« are inserted before the line »one«. But
busybox’s behaviour differs:

```
$ busybox ed
: i
one
two
three
four
five
.
: ,p
one
two
three
four
five
: 1
one
: i
ione
itwo
ithree
ifour
ifive
.
: ,p
ione
one
itwo
ithree
ifour
ifive
two
three
four
five
: q
Really quit? y
```

The line »ione« is inserted before »one« and the lines »itwo« through
»ifive« are appended after »one«. However, `append` works as expected.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: busybox (not installed)
ProcVersionSignature: Ubuntu 5.4.0-81.91-generic 5.4.128
Uname: Linux 5.4.0-81-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: Regolith:GNOME-Flashback:GNOME
Date: Sun Aug 29 08:27:55 2021
InstallationDate: Installed on 2020-10-14 (318 days ago)
InstallationMedia: Regolith 20.04.0 1.4.1 LTS amd64 (20200511)
SourcePackage: busybox
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: busybox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1941981

Title:
  busybox ed jumps line on insert

Status in busybox package in Ubuntu:
  New

Bug description:
  Busybox‘s implementation of `ed` skips a line when inserting. It will
  insert the first line before and all subsequent lines after the line
  addressed.

  gnu ed implementation behaves like expected:

  ```
  $ ed
  i
  one
  two
  three
  four
  five
  .
  ,p
  one
  two
  three
  four
  five
  1
  one
  i
  ione
  itwo
  ithree
  ifive
  .
  ,p
  ione
  itwo
  ithree
  ifive
  one
  two
  three
  four
  five
  Q
  ```

  The lines »ione« through »ifive« are inserted before the line »one«.
  But busybox’s behaviour differs:

  ```
  $ busybox ed
  : i
  one
  two
  three
  four
  five
  .
  : ,p
  one
  two
  three
  four
  five
  : 1
  one
  : i
  ione
  itwo
  ithree
  ifour
  ifive
  .
  : ,p
  ione
  one
  itwo
  ithree
  ifour
  ifive
  two
  three
  four
  five
  : q
  Really quit? y
  ```

  The line »ione« is inserted before »one« and the lines »itwo« through
  »ifive« are appended after »one«. However, `append` works as expected.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: busybox (not installed)
  ProcVersionSignature: Ubuntu 5.4.0-81.91-generic 5.4.128
  Uname: Linux 5.4.0-81-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: Regolith:GNOME-Flashback:GNOME
  Date: Sun Aug 29 08:27:55 2021
  InstallationDate: Installed on 2020-10-14 (318 days ago)
  InstallationMedia: Regolith 20.04.0 1.4.1 LTS amd64 (20200511)
  SourcePackage: busybox
  UpgradeStatus: No upgrade log present (probably fresh install)

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