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for all actions that operate on a frame.  Set WINDOW to selected
window if it was nil.

Do nothing in minibuffer-only frame.

Use frame-width, not screen-width.

Don't make the window shorter than window-min-height.

Do nothing for side-by-side windows.

expand is the minibuffer.

pos-visible-in-window-p.

window is the only window of its frame.  If the buffer ends in newline
and point is not at the end of the buffer, don't display last (empty) line.

Do nothing if window contents not entirely visible.

minor bug fix.  This is to avoid code duplication between vc.el,
electric.el, and finder.el.

(ctl-x-map): Added C-x - and C-x + as bindings for
shrink-window-if-larger-than-buffer and balance-windows respectively.
Since shrink-window-if-larger-than-buffer has to live here anyhow, let
users use it to manage screen space.