Fix handling of window-min-height/-width (Bug#16738).
* window.el (window--dump-window, window--dump-frame): New functions. (window--min-size-1): Account for window dividers. When window-resize-pixelwise is nil, delay rounding till after the sum of the window components has been calculated. (window--min-delta-1, window--max-delta-1): When PIXELWISE is nil make sure at least one text line and two text columns remain fully visible. (window-resize): Signal an error when window-resize-apply fails. (window--resize-child-windows): Fix calculation of by how many pixels a window can still be shrunk via window-new-normal. (adjust-window-trailing-edge): Call window--resizable with correct TRAIL argument.
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