[9fans] Bug: Acme: addr does not print the correct end of selection after addr=dot

[kalterdev@gmail.com]

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Expected behavior

It prints the beginning and end of the selection.

Unexpected behavior

It prints the beginning of the selection twice.

Steps to reproduce the problem

In fact, I do not know where the problem is located exactly, since I
rely on 9fans.net/go/acme. Assuming it handles the API correctly, the
steps are as follows:

Create a file with the following content, build it and run on any selection:

package main

import (
"fmt"
"os"
"strconv"

"9fans.net/go/acme"
)

func main() {
winid, _ := strconv.Atoi(os.Getenv("winid"))
w, _ := acme.Open(winid, nil)
w.ReadAddr() // make sure "addr" is open
w.Ctl("addr=dot")
r0, r1, _ := w.ReadAddr()
fmt.Println(r0, r1)
}

(Error handling is omitted intentionally.)

The address of the beginning is print twice, the end is lost.

plan9port version

a2567fcac9851e5cc965a236679f568b0e79cff2

OS version

macOS 14.5 (23F79)

------------------------------------------
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