[WIP] Send mail using internal mail wizard

web_widget_mail_send_odoo/static/src/css/web_widget_mail_send_odoo.css

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+.openerp .oe_form .oe_form_field_email_intern input,

web_widget_mail_send_odoo/static/src/js/web_widget_mail_send_odoo.js

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+/* © 2015 initOS GmbH (<http://www.initos.com>)
+*  License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+*/
+
+(function() {
+
+var instance = openerp;
+var _t = instance.web._t,
+   _lt = instance.web._lt;
+var QWeb = instance.web.qweb;
+
+instance.web.form.FieldEmailIntern = instance.web.form.FieldChar.extend({
+    template: 'FieldEmailIntern',
+    initialize_content: function() {
+        this._super();
+        var $button = this.$el.find('button');
+        $button.click(this.on_button_clicked);
+        this.setupFocus($button);
+    },
+    render_value: function() {
+        var self = this;
+        if (!this.get("effective_readonly")) {
+            this._super();
+        } else {
+            this.$el.find('a')
+                    //.attr('href', 'nix:' + this.get('value'))
+                    .removeAttr('href')
+                    .text(this.get('value') || '')
+                    .unbind('click')
+                    .click(function () {
+                        self.do_action('mail.action_email_compose_message_wizard',{
+                            additional_context:{
+                                default_partner_ids: self.field_manager.get_selected_ids()
+                        }})
+                    });
+
+        }
+    },
+    on_button_clicked: function() {
+        if (!this.get('value') || !this.is_syntax_valid()) {
+            this.do_warn(_t("E-mail Error"), _t("Can't send email to invalid e-mail address"));
+        } else {
+            // action to open: mail.action_email_compose_message_wizard
+            //location.href = 'mailto:' + this.get('value');
+            self.do_action('mail.action_email_compose_message_wizard')
+        }
+    }
+});
+
+instance.web.form.widgets.add('email', 'instance.web.form.FieldEmailIntern')
+//instance.web.form.widgets.add('email-intern', 'instance.web.form.FieldEmailIntern')
+
+})()

web_widget_mail_send_odoo/static/src/xml/web_widget_mail_send_odoo.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates>
+    <t t-name="FieldEmailIntern" t-extend="FieldEmail">
+        <t t-jquery="span:first">
+            this.removeClass('oe_form_field_email').addClass('oe_form_field_email_intern');
+        </t>
+    </t>
+</templates>