From 98d8aaddcf89090675d80d445e7563f040538af5 Mon Sep 17 00:00:00 2001
From: wlemb <wlemb>
Date: Thu, 18 Apr 2002 21:43:06 +0000
Subject: * src/roff/troff/input.cc (token::next): Make \H behave consistently
 if not in compatibility mode, i.e., increment relative to the previous
 height. * doc/groff.texinfo: Updated accordingly.

---
 ChangeLog               |  7 +++++++
 doc/groff.texinfo       | 23 +++++++++++++++++++----
 src/roff/troff/input.cc | 14 ++++++++++++--
 3 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 38c101ef..61bcd0b0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2002-04-18  Werner LEMBERG  <wl@gnu.org>
+
+	* src/roff/troff/input.cc (token::next): Make \H behave consistently
+	if not in compatibility mode, i.e., increment relative to the
+	previous height.
+	* doc/groff.texinfo: Updated accordingly.
+
 2002-04-17  Werner LEMBERG  <wl@gnu.org>
 
 	* doc/groff.texinfo: Document \\, \e, \E, \., and \c.
diff --git a/doc/groff.texinfo b/doc/groff.texinfo
index 146dedb1..65491a5d 100644
--- a/doc/groff.texinfo
+++ b/doc/groff.texinfo
@@ -8335,16 +8335,28 @@ the fly:
 @Example
 .mc \H'+5z'x\H'0'
 @endExample
+
+In compatibility mode, @code{gtroff} behaves differently:  If an
+increment or decrement is used, it is always taken relative to the
+current point size and not relative to the previously selected font
+height.  Thus,
+
+@Example
+.cp 1
+\H'+5'test \H'+5'test
+@endExample
+
+@noindent
+prints the word @samp{test} twice with the same font height (five
+points larger than the current font size).
 @endDefesc
 
 @cindex changing the font slant (@code{\S})
 @cindex font slant, changing (@code{\S})
 @cindex slant, font, changing (@code{\S})
 @DefescList {\\S, ', slant, '}
-@DefescItem {\\S, ', @t{+}@Var{slant}, '}
-@DefescListEnd {\\S, ', @t{-}@Var{slant}, '}
-Change (increment, decrement) the slant of the current font by @var{slant}
-degrees.  Positive values slant to the right.
+Slant the current font by @var{slant} degrees.  Positive values slant
+to the right.
 
 Currently, only the @option{-Tps} device supports this feature.
 
@@ -8356,6 +8368,9 @@ the fly:
 @Example
 .mc \S'20'x\S'0'
 @endExample
+
+This request is incorrectly documented in the original @acronym{UNIX}
+troff manual; the slant is always set to an absolute value.
 @endDefesc
 
 @cindex underlining (@code{ul})
diff --git a/src/roff/troff/input.cc b/src/roff/troff/input.cc
index 446bc3d5..398584b7 100644
--- a/src/roff/troff/input.cc
+++ b/src/roff/troff/input.cc
@@ -1828,8 +1828,18 @@ void token::next()
 	nd = new hmotion_node(x);
 	return;
       case 'H':
-	if (get_delim_number(&x, 'z', curenv->get_requested_point_size()))
-	  curenv->set_char_height(x);
+	// don't take height increments relative to previous height if
+	// in compatibility mode
+	if (!compatible_flag && curenv->get_char_height())
+	{
+	  if (get_delim_number(&x, 'z', curenv->get_char_height()))
+	    curenv->set_char_height(x);
+	}
+	else
+	{
+	  if (get_delim_number(&x, 'z', curenv->get_requested_point_size()))
+	    curenv->set_char_height(x);
+	}
 	if (!compatible_flag)
 	  have_input = 1;
 	break;
-- 
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