Dragging open tab into saved window shouldn't resize open tab

So this could be argued to be correct behavior, but I think it's less useful this way.

There is an option, "Restore saved windows in the original position and size." If you have this enabled, and you create a new window, then drag it into another SAVED window (with no tabs currently opened), it will resize the dragged window to whatever the size of the saved window was.

I think it would make much more sense if dragging an open window into a saved window would instead simply change the stored size of the saved window. This means that when you reorganize the Outliner with just a single window really open, it doesn't surprise you by resizing your (only) window.

My suggested fix would be to, when dragging something (the "Tab") in Outliner, detect if the window being dropped onto (the "Target") is currently open, or completely saved and closed. If the Target is completely saved and closed, and the Tab is open/visible, then overwrite the saved size in the Target with the size of the Tab. Visually, the Tab's window probably shouldn't close+reopen like it does now, but simply stay as-is.