More window code related fixes and documentation changes.
* window.c (Fother_window_for_scrolling): Check that Vother_window_scroll_buffer is a buffer. * window.el (fit-frame-to-buffer, fit-frame-to-buffer-margins): Fix doc-strings. (fit-frame-to-buffer): New argument ONLY. Remove dependency on fit-frame-to-buffer variable. Fix doc-string. (fit-window-to-buffer): Set ONLY argument in call of fit-frame-to-buffer. Fix doc-string. * frames.texi (Size and Position): Rewrite entries for `fit-frame-to-buffer' and `fit-frame-to-buffer-margins'. Add description for `fit-frame-to-buffer-sizes'. * windows.texi (Resizing Windows): Add descriptions for pixelwise resizing. Add entries for `window-resize-pixelwise' and `fit-window-to-buffer-horizontally'. Rewrite `fit-window-to-buffer' entry.
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