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hook_form_FORM_ID_alter being called twice (even before submit)

I want to make some changes to the “Content” page. The ID of the form is views_form_content_page_1, so I made a quick test (after drush cr of course):

function my_module_form_views_form_content_page_1_alter(&$form, FormStateInterface $form_state) {   kint($form); }

When I go to the page, the $form is being printed twice by the devel. I checked, all of the array items are the same. If I do kint('cat');, then it will print cat two times.

Why is this happening? Of course I could make it work, that my action will run only once (eventho drupal tries to run it twice) but I would like to rather solve this one, and understand if it’s a bug, and why it is happening.

This article was republished from its original source.
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hook_form_FORM_ID_alter being called twice (even before submit)

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