Commit f0d6a16d authored by Eli Zaretskii's avatar Eli Zaretskii

Fix documentation of 'x-underline-at-descent-line'

* doc/emacs/display.texi (Display Custom):
* src/nsterm.m (syms_of_nsterm):
* src/xterm.c (syms_of_xterm):
* src/w32term.c (syms_of_w32term): Mention the effect of
'line-spacing' on the underline position.  (Bug#30553)
parent 69a8f45e
......@@ -1848,8 +1848,11 @@ it may improve the legibility of underlined text for certain fonts.
area.) The variable @code{x-underline-at-descent-line} determines how
to draw underlined text. The default is @code{nil}, which means to
draw it at the baseline level of the font; if you change it to
@code{nil}, Emacs draws the underline at the same height as the font's
descent line.
@code{t}, Emacs draws the underline at the same height as the font's
descent line. (If non-default line spacing was specified for the
underlined text, see @ref{Line Height,,, elisp, The Emacs Lisp
Reference Manual}, Emacs draws the underline below the additional
spacing.)
@vindex overline-margin
The variable @code{overline-margin} specifies the vertical position
......
......@@ -9381,6 +9381,8 @@ Nil means use fullscreen the old (< 10.7) way. The old way works better with
DEFVAR_BOOL ("x-underline-at-descent-line",
x_underline_at_descent_line,
doc: /* Non-nil means to draw the underline at the same place as the descent line.
(If `line-spacing' is in effect, that moves the underline lower by
that many pixels.)
A value of nil means to draw the underline according to the value of the
variable `x-use-underline-position-properties', which is usually at the
baseline level. The default value is nil. */);
......
......@@ -7401,6 +7401,8 @@ sizes. */);
DEFVAR_BOOL ("x-underline-at-descent-line",
x_underline_at_descent_line,
doc: /* Non-nil means to draw the underline at the same place as the descent line.
(If `line-spacing' is in effect, that moves the underline lower by
that many pixels.)
A value of nil means to draw the underline according to the value of the
variable `x-use-underline-position-properties', which is usually at the
baseline level. The default value is nil. */);
......
......@@ -13260,6 +13260,8 @@ sizes. */);
DEFVAR_BOOL ("x-underline-at-descent-line",
x_underline_at_descent_line,
doc: /* Non-nil means to draw the underline at the same place as the descent line.
(If `line-spacing' is in effect, that moves the underline lower by
that many pixels.)
A value of nil means to draw the underline according to the value of the
variable `x-use-underline-position-properties', which is usually at the
baseline level. The default value is nil. */);
......
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