flectra/addons/mass_mailing/views/snippets_themes_options.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra>

<template id="snippet_options">
    <t t-call="web_editor.snippet_options"/>
    <t t-raw="0"/>

    <div data-js="width-x"
        data-selector="img, .mv, .col_mv, td, th"
        data-exclude=".o_mail_no_resize, .o_mail_wrapper_td"/>

    <div data-js="table_item"
        data-selector="td, th"
        data-exclude=".o_mail_wrapper_td"/>

    <div data-js="table_row"
        data-selector="tr:has(> .row), tr:has(> .col_mv)"
        data-drop-near="tr:has(> .row), tr:has(> .col_mv)">
    </div>

    <div data-js="table_column"
        data-selector=".col>td, .col>th"
        data-exclude=".o_mail_wrapper_td"
        data-drop-near=".col>td, .col>th">
    </div>

    <div data-js="table_column_mv"
        data-selector=".col_mv, td, th"
        data-exclude=".o_mail_wrapper_td"
        data-drop-near=".col_mv, td, th">
    </div>

    <div data-js="content"
        data-selector="[data-oe-field='body_html'] > div:not(.o_layout), [data-oe-field='body_html'] .oe_structure > div, .oe_snippet_body"
        data-drop-near="[data-oe-field='body_html']:not(:has(.o_layout)) > *, .oe_structure > *"
        data-drop-in="[data-oe-field='body_html']:not(:has(.o_layout)), .oe_structure">
    </div>

    <div data-js="resize"
        data-selector="[data-oe-field='body_html'] > div:not(.o_layout), [data-oe-field='body_html'] .oe_structure > div"
        data-exclude=".o_mail_no_resize, .o_mail_wrapper_td">
    </div>

    <div data-js="margin-y"
        data-selector="[data-oe-field='body_html'] > div:not(.o_layout), [data-oe-field='body_html'] .oe_structure > div, td, th"
        data-exclude=".o_mail_no_resize, .o_mail_wrapper_td">
    </div>

    <div data-js="colorpicker"
        data-selector="
            [data-oe-field='body_html'] > div:not(.o_layout),
            [data-oe-field='body_html'] .oe_structure > div,
            td, th
        "
        data-exclude=".o_mail_no_colorpicker">
        <li class="dropdown-submenu">
            <a tabindex="-1" href="#"><i class="fa fa-eyedropper"/>Background Color</a>
            <ul class="dropdown-menu">
                <li></li>
            </ul>
        </li>
    </div>
</template>

</flectra>