[FEATURE] Trigger event after modals dismiss

A new event ``modal-destroyed`` is triggered after modals dismissed.

Change-Id: Id05bf17889889bf1bacbd6a6ad3023923899671d
Resolves: #73720
Releases: master
Reviewed-on: https://review.typo3.org/46933


Reviewed-by: Jan Helke <typo3@helke.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>

typo3/sysext/backend/Resources/Public/JavaScript/Modal.js

@@ -228,6 +228,7 @@ define(['jquery',
 				Modal.instances.splice(lastIndex, 1);
 				Modal.currentModal = Modal.instances[lastIndex-1];
 			}
+			currentModal.trigger('modal-destroyed');
 			$(this).remove();
 			// Keep class modal-open on body tag as long as open modals exist
 			if (Modal.instances.length > 0) {

typo3/sysext/core/Documentation/Changelog/master/Feature-73720-TriggerEventAfterModalWindowDismissed.rst

+============================================================
+Feature: #73720 - Trigger event after modal window dismissed
+============================================================
+
+Description
+===========
+
+A new event ``modal-destroyed`` has been added that will be triggered after a modal window closed.
+
+
+Impact
+======
+
+Bind to the event ``modal-destroyed`` to achieve custom actions after the modal dismissed.
+
+Example code:
+
+.. code-block:: javascript
+
+	var $modal = Modal.confirm(); // stub code
+	$modal.on('modal-destroyed', function() {
+		// Reset the selection
+		$someCombobox.val('');
+	});
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