save.php

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<?php
$guid = get_input('guid');
$params = get_input('params');
$default_widgets = get_input('default_widgets', 0);
$context = get_input('context');
$title = get_input('title');

if ($default_widgets) {
    elgg_push_context('default_widgets');
}
elgg_push_context('widgets');

$widget = get_entity($guid);
if ($widget && $widget->saveSettings($params)) {
    if ($title && $title != $widget->title) {
        $widget->title = $title;
        $widget->save();
    }

    elgg_set_page_owner_guid($widget->getContainerGUID());
    if ($context) {
        elgg_push_context($context);
    }
    
    echo elgg_view('object/widget/elements/content', ['entity' => $widget]);
    
    if ($context) {
        elgg_pop_context();
    }
    
} else {
    register_error(elgg_echo('widgets:save:failure'));
}

// widgets context
elgg_pop_context();

if ($default_widgets) {
    elgg_pop_context();
}

forward(REFERER);