Customizer_register not saving custom setting to database

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The problem with the code sample is that the setting is using widget_ as the prefix. This is a reserved prefix for widgets, per the customizer handbook:

Important: Do not use a setting ID that looks like widget_*, sidebars_widgets[*], nav_menu[*], or nav_menu_item[*]. These setting ID patterns are reserved for widget instances, sidebars, nav menus, and nav menu items respectively. If you need to use “widget” in your setting ID, use it as a suffix instead of a prefix, for example “homepage_widget”.

Here is the modified code which works as expected:

<?php

namespace Roots\Sage\Customizer;

use Roots\Sage\Assets;

/**
 * Add customization settings for the theme
 */
function customize_register($wp_customize) {
    //////////////////////////
    // WIDGET STYLE OPTIONS //
    //////////////////////////
    $wp_customize->add_section( 'style_section_widget', array(
        'title'  => __('Widget Styling', __NAMESPACE__),
        'priority' => 115,
    ));

    $wp_customize->add_setting( 'list_style_widget', array(
        'default' => 'hide',
        'transport' => 'postMessage',
    ));

    $wp_customize->add_control( 'widget_list_style_control', array(
        'label' => __( 'Display List Style?', __NAMESPACE__),
        'Description' => __('Removes the symbols next to bulleted and    unbulleted lists in Widgets', __NAMESPACE__),
        'section' => 'style_section_widget',
        'settings' => 'list_style_widget',
        'type'    => 'radio',
        'choices' => array(
            'hide' => __('Hide'),
            'show' => __('Show'),
        ),
    ));

    // Add postMessage support
    $wp_customize->get_setting('blogname')->transport="postMessage";
    $wp_customize->get_setting('blogdescription')->transport="postMessage";
}

add_action('customize_register', __NAMESPACE__ . '\\customize_register', 11);

Note also that I changed the priority for customize_register from 10 (the default) to 11 since the blogname and blogdescription settings may not be registered at that point.

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