4 files changed, 96 insertions, 0 deletions
diff --git a/doc/context/documents/general/manuals/luatex.pdf b/doc/context/documents/general/manuals/luatex.pdf
index d4ddd2996..43bd3905f 100644
--- a/doc/context/documents/general/manuals/luatex.pdf
+++ b/doc/context/documents/general/manuals/luatex.pdf
diff --git a/doc/context/sources/general/fonts/fonts/fonts-environment.tex b/doc/context/sources/general/fonts/fonts/fonts-environment.tex
index 971da452d..d15a84fdc 100644
--- a/doc/context/sources/general/fonts/fonts/fonts-environment.tex
+++ b/doc/context/sources/general/fonts/fonts/fonts-environment.tex
@@ -3,6 +3,8 @@
     \environment manuals-explaining-environment
     \environment manuals-explaining-cover
 
+    \enabledirectives[visualizers.fraction=2]
+
     \usemodule [s] [fonts-tables]
     \usemodule [s] [fonts-missing]
     \usemodule [s] [fonts-vectors]
diff --git a/doc/context/sources/general/fonts/fonts/fonts-math.tex b/doc/context/sources/general/fonts/fonts/fonts-math.tex
index 7f226cb68..b9cadceeb 100644
--- a/doc/context/sources/general/fonts/fonts/fonts-math.tex
+++ b/doc/context/sources/general/fonts/fonts/fonts-math.tex
@@ -993,6 +993,50 @@ The results are collected here:
 
 \stopsection
 
+\startsection[title=Italics and limits]
+
+An \OPENTYPE\ font treats italic correction differently from traditional fonts.
+For that reason we provide a bit of control over the way the correction is
+applied. There is a parameter \type {\mathnolimitsmode} that controls the
+correction.
+
+\definebodyfontenvironment[20pt]
+
+\startlinecorrection
+\startcombination[5*1]
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[20pt]\mathnolimitsmode0$\displaystyle\int\nolimits^0_1$\hss}} {\tttf 0}
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[20pt]\mathnolimitsmode1$\displaystyle\int\nolimits^0_1$\hss}} {\tttf 1}
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[20pt]\mathnolimitsmode2$\displaystyle\int\nolimits^0_1$\hss}} {\tttf 2}
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[20pt]\mathnolimitsmode3$\displaystyle\int\nolimits^0_1$\hss}} {\tttf 3}
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[20pt]\mathnolimitsmode4$\displaystyle\int\nolimits^0_1$\hss}} {\tttf 4}
+\stopcombination
+\stoplinecorrection
+
+A value larger than 15 is interpreted as a factor (in the usual \TEX\ way 1000
+means 1.0). In \CONTEXT\ we set the value to 1 which means that the factors for
+super- and subscript are set via math parameters (or constants in the font). We
+use a default of \type {{0,750}} so we don't shift the superscript and the
+subscript we shift less than the italic correction. This is driven by a feature
+but you can change the values before loading a font, for instance with:
+
+\starttyping
+\adaptfontfeature[*math*][mathnolimitsmode={100,800}]
+\stoptyping
+
+The defaults come out as:
+
+\startlinecorrection
+\startcombination[5*1]
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[modern,  20pt]$\displaystyle\int\nolimits^0_1$\hss}} {\tttf modern}
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[xits,    20pt]$\displaystyle\int\nolimits^0_1$\hss}} {\tttf xits}
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[lucidaot,20pt]$\displaystyle\int\nolimits^0_1$\hss}} {\tttf lucidaot}
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[pagella, 20pt]$\displaystyle\int\nolimits^0_1$\hss}} {\tttf pagella}
+    {\ruledhbox to .15\hsize{\hss\showglyphs\switchtobodyfont[cambria, 20pt]$\displaystyle\int\nolimits^0_1$\hss}} {\tttf cambria}
+\stopcombination
+\stoplinecorrection
+
+\stopsection
+
 \stopchapter
 
 \stopcomponent
diff --git a/doc/context/sources/general/manuals/luatex/luatex-math.tex b/doc/context/sources/general/manuals/luatex/luatex-math.tex
index fe255de31..8e0c77119 100644
--- a/doc/context/sources/general/manuals/luatex/luatex-math.tex
+++ b/doc/context/sources/general/manuals/luatex/luatex-math.tex
@@ -464,6 +464,56 @@ Note 9: \type {FractionDelimiterDisplayStyleSize} and \type
 {FractionDelimiterSize} do not actually exist in the \quote {standard} \OPENTYPE\
 math font Cambria, but were useful enough to be added.
 
+\section{Nolimit correction}
+
+There are two extra math parameters \type {\Umathnolimitsupfactor} and \type
+{\Umathnolimitsubfactor} that were added to provide some control over how limits
+are spaced (for example the position of super and subscripts after integral
+operators). They relate to an extra parameter \type {\mathnolimitsmode}.
+
+\starttabulate[|l|ck1|ck1|ck1|ck1|ck1|ck1|]
+    \NC
+        \NC \mathnolimitsmode0    $\displaystyle\int\nolimits^0_1$
+        \NC \mathnolimitsmode1    $\displaystyle\int\nolimits^0_1$
+        \NC \mathnolimitsmode2    $\displaystyle\int\nolimits^0_1$
+        \NC \mathnolimitsmode3    $\displaystyle\int\nolimits^0_1$
+        \NC \mathnolimitsmode4    $\displaystyle\int\nolimits^0_1$
+        \NC \mathnolimitsmode8000 $\displaystyle\int\nolimits^0_1$
+    \NC \NR
+    \TB
+    \NC \bf mode
+        \NC \tttf 0
+        \NC \tttf 1
+        \NC \tttf 2
+        \NC \tttf 3
+        \NC \tttf 4
+        \NC \tttf 8000
+    \NC \NR
+    \NC \bf superscript
+        \NC +ic/2
+        \NC font
+        \NC 0
+        \NC 0
+        \NC 0
+        \NC 0
+    \NC \NR
+    \NC \bf subscript
+        \NC -ic/2
+        \NC font
+        \NC 0
+        \NC -ic/2
+        \NC -ic
+        \NC 8000ic/1000
+    \NC \NR
+\stoptabulate
+
+When the mode is set to one, the math parameters are used. This way a macro
+package writer can decide what looks best. Given the current state of fonts in
+\CONTEXT\ we currently use 0 for the superscript and 750 for the subscripts.
+Positive values are used for both parameters but the subscript 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 spacing setting}
 
 Besides the parameters mentioned in the previous sections, there are also 64 new