Pull Request resolves #47206 .

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

After closing the Batch modal in the Administrator (Articles, Modules, etc.), the Filter Options button does not open the filter panel.

Root cause:
When the Batch modal is closed, a joomla:updated event is dispatched. This re-triggers Searchtools initialization, causing duplicate click event listeners to be attached to the filter toggle button.

With two listeners attached:

First handler adds the visibility class

Second handler removes it immediately

Result: No visible change.

Fix:
Added an idempotent initialization guard in the Searchtools constructor using a dataset flag on the form element to prevent duplicate initialization when joomla:updated fires.

This ensures:

Only one listener is attached

Toggle behavior remains correct

Lifecycle remains stable during async admin updates

Testing Instructions

Go to Administrator → Content → Articles

Click Actions → Batch

Click Cancel

Click Filter Options

Repeat the same test in:

Administrator → Content → Modules

Optional console verification:

getEventListeners(document.querySelector('.js-stools-btn-filter')).click.length

Should return 1.

Actual result BEFORE applying this Pull Request

After closing the Batch modal, clicking Filter Options does nothing.

Two click listeners are attached to the filter button, causing the toggle to execute twice.

Expected result AFTER applying this Pull Request

After closing the Batch modal, clicking Filter Options correctly opens the filter panel.

Only one click listener is attached.

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed