`marco --replace` fails to terminate existing instances, causing multiple concurrent window manager instances

[davidhedlund]

Steps to reproduce

• Add this to test.sh

#!/bin/bash
for i in {1..5}; do
    echo "------------------------------"
    pgrep -a marco
    pgrep -a mate-panel
    marco --replace 2>/dev/null &
    mate-panel --replace 2>/dev/null &
    sleep 1
done

• chmod 755 test.sh
• ./test.sh

Notes (see #807 (comment)):

• You must execute the script file. Do not copy/paste the bash code directly to the terminal.
• "2>/dev/null" was needed to suppress warning messages in Ubuntu MATE, but it has nothing to do with this issue.

Current behaviour

------------------------------
2261 marco
2277 mate-panel
------------------------------
2261 marco
2819 marco --replace
2820 mate-panel --replace
------------------------------
2261 marco
2819 marco --replace
2932 marco --replace
2933 mate-panel --replace
------------------------------
2261 marco
2819 marco --replace
2932 marco --replace
3010 marco --replace
3011 mate-panel --replace
------------------------------
2261 marco
2819 marco --replace
2932 marco --replace
3010 marco --replace
3086 marco --replace
3087 mate-panel --replace

Expected behavior

------------------------------
2261 marco
2277 mate-panel
------------------------------
2819 marco --replace
2820 mate-panel --replace
------------------------------
2932 marco --replace
2933 mate-panel --replace
------------------------------
3010 marco --replace
3011 mate-panel --replace
------------------------------
3086 marco --replace
3087 mate-panel --replace

Distro

Ubuntu MATE 24.04