* src/xdisp.c (hscrolling_current_line_p): New function.
(init_iterator): If auto-hscrolling just the current line, don't
increment the iterator's first_visible_x and last_visible_x
variables.
(hscroll_window_tree): Recompute window's hscroll when moving
vertically to another screen line.
(redisplay_window): If we are hscrolling only the current line,
disable the optimizations that rely on the current matrix being
up-to-date.
(display_line): Accept an additional argument CURSOR_VPOS, the
vertical position of the current screen line which might need
hscrolling; all callers changed. Compute first_visible_x and
last_visible_x specially when auto-hscrolling current line, by
repeating the calculation that is done in init_iterator in other
modes.
(syms_of_xdisp) <auto-hscroll-mode>: No longer boolean, it can now
accept a 3rd value 'current-line, to turn on the mode where
only the current line is hscrolled.
* etc/NEWS: Mention the new auto-hscroll-mode value.
This directory contains the architecture-independent files used by or
with Emacs. This includes some text files of documentation for GNU
Emacs or of interest to Emacs users, and the file of dumped docstrings
for Emacs functions and variables.
COPYRIGHT AND LICENSE INFORMATION FOR IMAGE FILES
File: emacs.icon
Author: Sun Microsystems, Inc
Copyright (C) 1999, 2001-2017 Free Software Foundation, Inc.
License: GNU General Public License version 3 or later (see COPYING)
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