if I already have a vertical/horizontal split open and I split another file horizontally or vertically, by default it creates a new split. I'd like to control this behavior with a keyboard shortcut so the split will go to an existing vertical/horizontal split instead.
I've attached screenshots show my editor with 3 splits already. The second screenshot is what happens if I just create a new vertical split (now there are 3). The third screenshot is the behavior I want so that there are still 2 vertical splits (it just moved to the closest right split).