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Assume it is 0.  All callers changed.
(Fenlarge_window, Fshrink_window): Likewise.

window-point of one window to another.

(Fadjust_window_trailing_edge): New function.
(syms_of_window): defsubr it.
(window_deletion_count): New variable.
(delete_window): Update window_deletion_count.

Don't abuse the `mini' arg.  Use the `obj' arg instead.

(enlarge_window): Rename WIDTHFLAG to HORIZ_FLAG.
(CURBEG, CURSIZE): Use HORIZ_FLAG instead of WIDTHFLAG.

determine whether to consider dedicated windows as well.
(Fget_lru_window, Fget_largest_window): Add `dedicated' argument.
(Fdisplay_buffer): Do consider dedicated windows in those cases where
we will split the window rather than reuse it.
Don't try to use windows on other displays.

Fix x position for ON_TEXT when left margin width > 0.

ON_SCROLL_BAR.

(Fwindow_split_tree): New defun.
(syms_of_window): Defsubr it.

(window_fixed_size_p): Don't use it.

(Fcurrent_window_configuration): Use VECSIZE macro instead.

Improve argument/docstring consistency.

finding point when scrolling up.

Handle `scroll-preserve-screen-position' non-nil, non-t specially.
(syms_of_window): <scroll-preserve-screen-position>: Doc fix.

a h/vchild.

(syms_of_window): Doc fixes.

(syms_of_window): Initialize window-size-fixed to nil.
But don't DEFVAR window_size_fixed.

among several possible points for the new_current_buffer.

handle partial visible line at end of window even when we hit PT.

direction if window height was smaller than next-screen-context-lines.
Now always scroll at least one line in the requested direction.
Ensure that we actually do scroll backwards when requested to do so.

partially visible rows.
(window_scroll_pixel_based): Adapt to that change.

if scrolling doesn't move start point, e.g. if looking at tall image.

(syms_of_window): DEFVAR_BOOL it.
(Fpos_visible_in_window_p): Extend return value to include RTOP
and RBOT values if FULLY is nil.
(window_scroll_pixel_based): Adjust vscroll for partially visible
rows if auto_window_vscroll_p is set.
(Fset_window_vscroll): Do nothing if vscroll is not modified.