window is reloaded after changing page_for_posts in Customizer even with transport->postMessage

[martinmalinda]

I am setting up postMessage transport like this:

$wp_customize->get_setting( 'page_for_posts' )->transport = 'postMessage';

My hook function ins theme-customize.js is invoked, but the window gets refreshed immediately afterward which prevents doing anything meaningful.

It's also happening for page_on_front and probably show_on_front settings.

postMessage works correctly for other components for me.

[westonruter]

Actually, the preview isn't refreshing, but rather it is changing the URL to the page you just switched to. This is intentional. See this snippet in customize-controls.js:

// Change the previewed URL to the selected page when changing the page_for_posts.
api( 'page_for_posts', function( setting ) {
        setting.bind(function( pageId ) {
                pageId = parseInt( pageId, 10 );
                if ( pageId > 0 ) {
                        api.previewer.previewUrl.set( api.settings.url.home + '?page_id=' + pageId );
                }
        });
});

This behavior was introduced in #30677.