Fix and rewrite doc on window recombining facilities.
* window.c (Fsplit_window_internal): Set combination limit of new parent window to t iff Vwindow_combination_limit is t; fixing a regression introduced with the change from 2012-09-22. (Fwindow_combination_limit, Fset_window_combination_limit): Fix doc-strings. * elisp.texi (Top): Add Recombining Windows to menu. * windows.texi (Recombining Windows): New subsection. (Splitting Windows): Rewrite text on handling of window combinations and move it to new subsection.
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