[Colorpicker] `open-on-focus` prop seems to have no effect

[kikuomax]

Overview of the problem

Buefy version: [0.1.4] Vuejs version: [3.3.10] OS/Browser: macOS/Safari

Description

The open-on-focus prop of Colorpicker does not seem to have any effect.

Steps to reproduce

<template>
    <section>
        <b-field label="Select a color">
            <b-colorpicker model-value="#7957d5" open-on-focus />
        </b-field>
    </section>
</template>

Expected behavior

To be honest, I do not known the true intention of the prop, however, I think that the colorpicker would open after the trigger gains a focus.

Actual behavior

The colorpicker won't open after focusing the trigger.

[kikuomax]

openOnFocus is not even defined as a prop of Colorpicker.