web/web_tree_image_tooltip/static/src/js/tooltip.js

odoo.define('web_tree_image_tooltip.web_tree_image_tooltip',
        function (require) {
    "use strict";

    var ListRenderer = require('web.ListRenderer');
    ListRenderer.include({
        events: _.extend({}, ListRenderer.prototype.events, {
            'mouseover tbody tr td .o_field_image': '_onHoverRecord_img',
        }),
        _onHoverRecord_img: function (event) {
            var img_src =
                $(event.currentTarget).children('.img-fluid').attr('src')
            $(event.currentTarget).tooltip({
                title: "<img src="+img_src+" />",
                delay: 0,
            }).tooltip('show');
        }
    });
})