[Bug 281340] ex editor global command malfunctions when adding lines to matched lines that are consecutive

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281340

            Bug ID: 281340
           Summary: ex editor global command malfunctions when adding
                    lines to matched lines that are consecutive
           Product: Base System
           Version: 14.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: gnu
          Assignee: bugs@FreeBSD.org
          Reporter: llaquet@protonmail.com

Original buffer for all the commands:

lin1
lin2
lin3
lin4

Command: g/[1|3]/ co .

Resulting buffer (correct):

lin1
lin1
lin2
lin3
lin3
lin4

Command: g/[2|4]/ co .

Resulting buffer (correct):

lin1
lin2
lin2
lin3
lin4
lin4

Command: g/[2|3]/ co .

Resulting buffer (incorrect):

lin1
lin2
lin2
lin3
lin4
lin4

Command: g/[3|4]/ co .

Error message: Illegal address: only 5 lines in the file
Resulting buffer (incorrect):

lin1
lin2
lin3
lin3
lin4

Command: g/./ co .

Error message: Illegal address: only 6 lines in the file
Resulting buffer (incorrect):

lin1
lin1
lin2
lin3
lin3
lin4

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