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Variables Controlling Display
This section contains information for customization only. Beginning
users should skip it.
The variable `mode-line-inverse-video' controls whether the mode
line is displayed in inverse video (assuming the terminal supports it);
`nil' means don't do so. Note: Mode Line.
If the variable `inverse-video' is non-`nil', Emacs attempts to
invert all the lines of the display from what they normally are.
When you reenter Emacs after suspending, Emacs normally clears the
screen and redraws the entire display. On some terminals with more than
one page of memory, it is possible to arrange the termcap entry so that
the `ti' and `te' strings (output to the terminal when Emacs is entered
and exited, respectively) switch between pages of memory so as to use
one page for Emacs and another page for other output. In that case,
you might want to set the variable `no-redraw-on-reenter' to non-`nil'
so that Emacs will assume, when resumed, that the screen page it is
using still contains what Emacs last wrote there.
The variable `echo-keystrokes' controls the echoing of
multi-character keys; its value is the number of seconds of pause
required to cause echoing to start, or zero, meaning don't echo at all.
Note: Echo Area.
If the variable `ctl-arrow' is `nil', control characters in the
buffer are displayed with octal escape sequences, all except newline and
tab. If its value is `t', then control characters will be printed with
an up-arrow, for example `^A'.
If its value is not `t' and not `nil', then characters whose code is
greater than 160 (that is, the space character (32) with its high bit
set) will be assumed to be printable, and will be displayed without
alteration. This is the default when running under X Windows, since
Lucid Emacs assumes an ISO/8859-1 character set (also known as
"Latin1"). The `ctl-arrow' variable may also be set to an integer, in
which case all characters whose codes are greater than or equal to that
value will be assumed to be printable.
Altering the value of `ctl-arrow' makes it local to the current
buffer; until that time, the default value is in effect. *Note
Normally, a tab character in the buffer is displayed as whitespace
which extends to the next display tab stop position, and display tab
stops come at intervals equal to eight spaces. The number of spaces
per tab is controlled by the variable `tab-width', which is made local
by changing it, just like `ctl-arrow'. Note that how the tab character
in the buffer is displayed has nothing to do with the definition of TAB
as a command.
If you set the variable `selective-display-ellipses' to `nil', the
three dots at the end of a line that precedes invisible lines do not
appear. There is no visible indication of the invisible lines. This
variable becomes local automatically when set.
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