My perfect (hypothetical) editor doesn't try to keep you "in" but it interacts with other tools supremely well. I can use it to find text, to mark or select it

My perfect (hypothetical) editor doesn't try to keep you "in" but it interacts with other tools supremely well. I can use it to find text, to mark or select it and then apply a great variety of tools to it. I might select text in another application and then find myself live-editing it in my editor so that I can always use my favorite tool no matter what the application might be. It also expects interoperability from other tools - so there's no file load dialog or project files view because all you do is load up your operating system's file manager and drag and drop. It, with other components, build up into what one might call an IDE and it's up to me to construct my custom tool from all the bits including the editor.