Hacks for https://discuss.kde.org/t/renaming-files-in-dolphin-does-not-work/44483/46:

file-rename-hack.sh

#!/usr/bin/bash


set -eEu


cue-fatal()
{
    local title="$1" message="$2"

    notify-send \
        --hint='string:desktop-entry:org.kde.dolphin' \
        --app-name='file-rename-hack' \
        --icon='dialog-error' \
        --expire-time=4000 \
        "$title" \
        "$message"
    exit 1
}

main()
{
    local class wid path new_name new_path

    local -a info=()
    # get current window class and PID
    readarray -t info < <( xdotool getactivewindow getwindowclassname getactivewindow )
    class="${info[0]}"
    wid="${info[1]}"

    [ "$class" == 'dolphin' ] || cue-fatal 'Unsupported app'  "Called from:\n<b>$class</b>\nThis script is to be used in a Dolphin window."

    # simulate pressing the 'Menu' key, then 'r' after 50 msecs
    xdotool key --window "$wid" 'Menu' && sleep 0.05 && xdotool key --window "$wid" 'r'
}

main "$@"

file-rename-hacks-test.sh

#!/usr/bin/bash


set -eEu
. .notify-desktop
. .qdbus


# same inline renaming as Dolphin
rename-by-action()
{
    local id="$1"
    dolphin-action-trigger "$id" 'renamefile'
}

# copy the file-to-be-renamed location to clipboard,
# then use it to open a kdialog for renaming
rename-by-dialog()
{
    local qid="$1"
    # copy location to clipboard (copy_location)
    dolphin-action-trigger "$qid" 'copy_location'
    # retrieve path from the clipboard
    path="$( xclip -selection clipboard -out )" # get path from  the clipboard
    new_name="$( kdialog --title "Rename File" --inputbox "Type the new name:" "$( basename "$path" )" )"
    new_path="$( dirname "$path" )/$new_name"
    if mv "$path" "$new_path"; then
        echo "Renamed '$path' to '$new_path'." | systemd-cat --identifier="${0##*/}" --priority='info'
    else
        echo "Failed renaming '$path' to '$new_path'!" | systemd-cat --identifier="${0##*/}" --priority='warning'
    fi
}

# simulate pressing the 'Menu' key, then 'r' after 50 msecs
rename-by-context()
{
    local wid="$1"
    xdotool key --window "$wid" 'Menu' && sleep 0.05 && xdotool key --window "$wid" 'r'
}

main()
{
    local class qid wid path new_name new_path

    local -a info=()
    # get current window class and PID
    readarray -t info < <( xdotool getactivewindow getwindowclassname getwindowpid getactivewindow )
    class="${info[0]}"
    qid="org.kde.dolphin-${info[1]}"
    wid="${info[2]}"

    [ "$class" == 'dolphin' ] || cue-fatal 'Unsupported app' "Called from:\n<b>$class</b>\nThis script is to be used in a Dolphin window." "${0##*/}"

    #rename-by-dialog "$qid"
    #rename-by-action "$qid"
    rename-by-context "$wid"
}

main "$@"