Deactivate drop event on the table filter field


I want to prevent users from dropping on the filter field of a table.
(for example : URL of Image or text selection)
I have no idea how to do this because the filter field has no properties in the designer.

Thanks in advance for your ideas and help

Illustration from OnLineDemo where the selected text can be dragged to the alarm status table filter field:

thats not really possible without manipulating the html.
you could put your own textfield (pretty sure the on drop doesnt work i those) above it tho and bind it with the prop filter.text