2017-02-19 17:20:00

4 files changed, 60 insertions, 1 deletions

diff --git a/doc/context/sources/general/fonts/fonts/fonts-extensions.tex b/doc/context/sources/general/fonts/fonts/fonts-extensions.tex
index 89257f1f5..4740b40b2 100644
--- a/doc/context/sources/general/fonts/fonts/fonts-extensions.tex
+++ b/doc/context/sources/general/fonts/fonts/fonts-extensions.tex
@@ -294,6 +294,22 @@ and right. Keep in mind that this feature blocks colored text.
 
 \stopsection
 
+\startsection[title=Math italics]
+
+In the traditional \TEX\ fonts the width of a glyph was not the real width because
+one had to add the italic correction to it. The engine then juggles a bit with
+these properties. If you run into fonts that are designed this way, you can do this:
+
+\starttyping
+\definefontfeature[mathextra][italicwidths=yes] % fix latin modern
+\stoptyping
+
+This might make \type {$\left|V\right| = \left|W\right|$} look better for such
+fonts. Of course there can be side effects because these fonts assume a
+traditional engine.
+
+\stopsection
+
 \startsection[title=Slanting]
 
 This features (as well as the one described in the next section) are seldom used
diff --git a/doc/context/sources/general/fonts/fonts/fonts-features.tex b/doc/context/sources/general/fonts/fonts/fonts-features.tex
index c0b7538ab..f6a12c30d 100644
--- a/doc/context/sources/general/fonts/fonts/fonts-features.tex
+++ b/doc/context/sources/general/fonts/fonts/fonts-features.tex
@@ -1,4 +1,4 @@
-% language=uk
+language=uk
 
 \startcomponent fonts-features
 
diff --git a/doc/context/sources/general/manuals/luatex/luatex-math.tex b/doc/context/sources/general/manuals/luatex/luatex-math.tex
index b19f5823f..3c29d9609 100644
--- a/doc/context/sources/general/manuals/luatex/luatex-math.tex
+++ b/doc/context/sources/general/manuals/luatex/luatex-math.tex
@@ -613,6 +613,30 @@ shifts to the left. A \type {\mathnolimitsmode} larger that 15 is considered to
 be a factor for the subscript correction. This feature can be handy when
 experimenting.
 
+\section{Math italic mess}
+
+The \type {\mathitalicsmode} parameter can be set to~1 to force italic correction
+before noads that represent some more complex structure (read: everything
+that is not an ord, bin, rel, open, close, punct or inner).
+
+\starttexdefinition Whatever #1
+    \NC \type{\mathitalicsmode=#1}
+    \NC \mathitalicsmode#1\ruledhbox{$\left|T^1\right|$}
+    \NC \mathitalicsmode#1\ruledhbox{$\left|T\right|$}
+    \NC \mathitalicsmode#1\ruledhbox{$T+1$}
+    \NC \mathitalicsmode#1\ruledhbox{$T{1\over2}$}
+    \NC \mathitalicsmode#1\ruledhbox{$T\sqrt{1}$}
+    \NR \NR
+\stoptexdefinition
+
+\starttabulate[|c|c|c|c|c|c|]
+    \Whatever0
+    \Whatever1
+\stoptabulate
+
+This kind of parameters relate to the fact that italic correction in \OPENTYPE\
+math is bound to fuzzy rules. So, control is the solution.
+
 \section{Math spacing setting}
 
 Besides the parameters mentioned in the previous sections, there are also 64 new
diff --git a/doc/context/sources/general/manuals/math/math-spacing.tex b/doc/context/sources/general/manuals/math/math-spacing.tex
index 0acd07b33..3412a3abc 100644
--- a/doc/context/sources/general/manuals/math/math-spacing.tex
+++ b/doc/context/sources/general/manuals/math/math-spacing.tex
@@ -373,6 +373,25 @@ an integral are moved right and left half of the italic correction.
 
 \stopsection
 
+\startsection[title=Bad fonts]
+
+There might be fonts out there where the italic correction is supposed to be
+added to the width of a glyph. In that case the following trick can be tried:
+
+\starttyping
+\definefontfeature[mathextra][italicwidths=yes] % fix latin modern
+\stoptyping
+
+in which case the following might look better:
+
+\starttyping
+$\left|V\right| = \left|W\right|$
+\stoptyping
+
+Of course better is to fix the font.
+
+\stopsection
+
 \stopchapter
 
 \stopcomponent