Bug: Acme: addr does not print the correct end of selection after addr=dot

[spektrokalter]

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

a2567fc

9fans.net/go version

v0.0.7

OS version

macOS 14.5 (23F79)