Why did you change the Find and Replace facility when the old one wasn't broke?! The icons are not obvious and I have to hover over them every time to find what's what. And it regularly mis-guesses what I want to find and replace. All of which wastes so much more time.
And it often simply doesn't work - I search for "stats" to find my call to dbms_stats and it highlights an "st" way after it should've found "stats".
Stop fixing things that ain't broke! Why not fix something that IS broke?! Like still being unable to drag a file into SQL Dev unless a SQL Worksheet is the open window, which has been happening for many many months now.
So do you want to complain about search and replace or drag and drop?
If search and replace, share some text and some use cases, because it works great for me. Not for you, so help us to help you.