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Juri Linkov authored
Vsplit_window_preferred_function out of conditions that check if window is eligible for vertical splitting. When Vsplit_window_preferred_function is non-nil, call it and use its non-nil return value as window. Otherwise, continue doing vertical splitting using Fsplit_window with arg horflag=nil. (syms_of_window) <Vsplit_window_preferred_function>: Change the default value from `split-window' to nil.
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