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WordPress plugin ‘WP_widget’ deprecated, how to fix it?

Solution:

Replace this:

$this->WP_Widget(PLUGIN_SLUG, __(PLUGIN_NAME, PLUGIN_LOCALE), $widget_option);
with

parent::__construct(PLUGIN_SLUG, __(PLUGIN_NAME, PLUGIN_LOCALE), $widget_option);
You may have to place it first in the __construct function that contains that line.