Don't want to forget that. Will be moved to a bug report Workaround after I found it
currently the title or text button to search for is disabled after you added by the middle mouse button a search term.
a workaround is currently to click left of the box.
By this the buttons become enabled again and the search text remains in the field.
In difference if there is no value in that input field the text becomes replaced by Search.
That means we can already look at the input field and do verify if it is empty or changed.