(window_min_size_2): New function.
(window_min_size_1, size_window, Fdisplay_buffer) (Fsplit_window, adjust_window_trailing_edge): Use it to avoid windows without mode- or header-lines when window-min-height is too small. (size_window): Reset nodelete_p after testing it, following an earlier note by Kim F. Storm. (display_buffer): Do not set split_height_threshold to twice the value of window_min_height to avoid changing the value of a customizable variable. Rather explicitly check whether the height of the window that shall be splitted is at least as large as split_height_threshold.
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