How can I move a window from being a horizontal split down below all other windows to being a vertical split panel on the left? I don't want to move buffer contents - I want to move the actual window.
Emacswiki has a nice function for toggling horizontal to vertical split here
(defun toggle-window-split () (interactive) (if (= (count-windows) 2) (let* ((this-win-buffer (window-buffer)) (next-win-buffer (window-buffer (next-window))) (this-win-edges (window-edges (selected-window))) (next-win-edges (window-edges (next-window))) (this-win-2nd (not (and (<= (car this-win-edges) (car next-win-edges)) (<= (cadr this-win-edges) (cadr next-win-edges))))) (splitter (if (= (car this-win-edges) (car (window-edges (next-window)))) 'split-window-horizontally 'split-window-vertically))) (delete-other-windows) (let ((first-win (selected-window))) (funcall splitter) (if this-win-2nd (other-window 1)) (set-window-buffer (selected-window) this-win-buffer) (set-window-buffer (next-window) next-win-buffer) (select-window first-win) (if this-win-2nd (other-window 1))))))
In the emacswiki example the function is bind to
C-x 4 map as
(define-key ctl-x-4-map "t" 'toggle-window-split)
There are a couple more implementations on that page you can try.