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lyx_mirror/src/mathed/InsetMathFrac.cpp
Jean-Marc Lasgouttes 89662a6852 Re-implement math markers logic. 
The goal of this patch is to be able to properly remove the space
needed for markers in the case of insets that are inside macros and do
not need these markers. This was attempted at 9a9a6a8, but did not
work reliably.

To this end, the following simplifications are made:

* instead of drawing its own markers, each inset has a virtual method
  marker() which prescribes either NO_MARKER, MARKER (normal bottom
  marker) or MARKER2 (top and bottom marker). All explicit calls to
  (draw|metrics)Markers(|2) are removed.

* the space necessary for the markers is now counted in the
  before/above margins in the row structure. Therefore painting will
  not happen at (x + 1, y), but just (x,y).

* the methods drawDecoration are removed.

* the helper methods InsetMath::(draw|metrics)Markers(|2) are removed
  and replaced by a new function drawMarkers in MathRow.cpp.

Now the marker type is kept in the MathRow::Element object (and set to
NO_MARKER in not editable context) and the marker is accounted for in
MathRow::(metrics|draw).

Moreover, the extra pixel for the marker is taken on the before/After
space if possible. The marker will only require extra space when
before/after is 0.

See comment 168 of #8883 to understand what issues are fixed.
2017-01-11 17:35:34 +01:00

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/**
* \file InsetMathFracBase.cpp
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Alejandro Aguilar Sierra
* \author André Pönitz
* \author Uwe Stöhr
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "InsetMathFrac.h"
#include "MathData.h"
#include "MathParser.h"
#include "MathStream.h"
#include "MathSupport.h"
#include "Cursor.h"
#include "LaTeXFeatures.h"
#include "MetricsInfo.h"
#include "TextPainter.h"
#include "frontends/FontMetrics.h"
#include "frontends/Painter.h"
#include "support/lassert.h"
using namespace std;
namespace lyx {
/////////////////////////////////////////////////////////////////////
//
// InsetMathFracBase
//
/////////////////////////////////////////////////////////////////////
InsetMathFracBase::InsetMathFracBase(Buffer * buf, idx_type ncells)
: InsetMathNest(buf, ncells)
{}
bool InsetMathFracBase::idxUpDown(Cursor & cur, bool up) const
{
// If we only have one cell, target = 0, otherwise
// target = up ? 0 : 1, since upper cell has idx 0
InsetMath::idx_type target = nargs() > 1 ? !up : 0;
if (cur.idx() == target)
return false;
cur.idx() = target;
cur.pos() = cell(target).x2pos(&cur.bv(), cur.x_target());
return true;
}
/////////////////////////////////////////////////////////////////////
//
// InsetMathFrac
//
/////////////////////////////////////////////////////////////////////
InsetMathFrac::InsetMathFrac(Buffer * buf, Kind kind, InsetMath::idx_type ncells)
: InsetMathFracBase(buf, ncells), kind_(kind)
{}
Inset * InsetMathFrac::clone() const
{
return new InsetMathFrac(*this);
}
InsetMathFrac * InsetMathFrac::asFracInset()
{
return kind_ == ATOP ? 0 : this;
}
InsetMathFrac const * InsetMathFrac::asFracInset() const
{
return kind_ == ATOP ? 0 : this;
}
bool InsetMathFrac::idxForward(Cursor & cur) const
{
InsetMath::idx_type target = 0;
if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
if (nargs() == 3)
target = 0;
else if (nargs() == 2)
target = 1;
} else
return false;
if (cur.idx() == target)
return false;
cur.idx() = target;
cur.pos() = cell(target).x2pos(&cur.bv(), cur.x_target());
return true;
}
bool InsetMathFrac::idxBackward(Cursor & cur) const
{
InsetMath::idx_type target = 0;
if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
if (nargs() == 3)
target = 2;
else if (nargs() == 2)
target = 0;
} else
return false;
if (cur.idx() == target)
return false;
cur.idx() = target;
cur.pos() = cell(target).x2pos(&cur.bv(), cur.x_target());
return true;
}
MathClass InsetMathFrac::mathClass() const
{
// Generalized fractions are of inner class (see The TeXbook, p. 292)
// But stuff from the unit/nicefrac packages are not real fractions.
MathClass mc = MC_ORD;
switch (kind_) {
case ATOP:
case OVER:
case FRAC:
case DFRAC:
case TFRAC:
case CFRAC:
case CFRACLEFT:
case CFRACRIGHT:
mc = MC_INNER;
break;
case NICEFRAC:
case UNITFRAC:
case UNIT:
break;
}
return mc;
}
namespace {
// align the top of M in the cell with the top of M in the surrounding font
int dy_for_nicefrac(MetricsBase & mb)
{
// this is according to nicefrac.sty
int big_m = theFontMetrics(mb.font).ascent('M');
Changer dummy = mb.changeScript();
int small_m = theFontMetrics(mb.font).ascent('M');
return big_m - small_m;
}
// symbol for nicefrac solidus
latexkeys const * slash_symbol()
{
return in_word_set(from_ascii("slash"));
}
} // anon namespace
void InsetMathFrac::metrics(MetricsInfo & mi, Dimension & dim) const
{
Dimension dim0, dim1, dim2;
Changer dummy3 = mi.base.changeEnsureMath();
switch (kind_) {
case UNIT: {
// \unitone, \unittwo
dim.wid = 0;
int unit_cell = 0;
// is there an extra cell holding the value being given a dimension?
// (this is \unittwo)
if (nargs() == 2) {
cell(0).metrics(mi, dim1);
dim.wid += dim1.wid + 4;
unit_cell = 1;
}
Changer dummy = mi.base.font.changeShape(UP_SHAPE);
cell(unit_cell).metrics(mi, dim0);
dim.wid += dim0.width() + 1;
dim.asc = max(dim0.asc, dim1.asc);
dim.des = max(dim0.des, dim1.des);
}
break;
case UNITFRAC:
case NICEFRAC: {
// \unitfrac, \unitfracthree, \nicefrac
dim.wid = 0;
dim.asc = 0;
dim.des = 0;
int const dy = dy_for_nicefrac(mi.base);
// is there an extra cell holding the value being given a dimension?
// (this is \unitfracthree)
if (kind_ == UNITFRAC && nargs() == 3) {
cell(2).metrics(mi, dim2);
dim.wid += dim2.wid + 4;
dim.asc = dim2.asc;
dim.des = dim2.des;
}
Changer dummy = (kind_ == UNITFRAC) ? mi.base.font.changeShape(UP_SHAPE)
: Changer();
Changer dummy2 = mi.base.changeScript();
if (latexkeys const * slash = slash_symbol()) {
Dimension dimslash;
mathedSymbolDim(mi.base, dimslash, slash);
dim.wid += dimslash.wid - mathed_mu(mi.base.font, 3.0);
dim.asc = max(dim.asc, dimslash.asc);
dim.des = max(dim.des, dimslash.des);
}
cell(0).metrics(mi, dim0);
cell(1).metrics(mi, dim1);
dim.wid += dim0.wid + dim1.wid + 2;
dim.asc = max(max(dim.asc, dim0.asc + dy), dim1.asc);
dim.des = max(max(dim.des, dim0.des - dy), dim1.des);
}
break;
case FRAC:
case CFRAC:
case CFRACLEFT:
case CFRACRIGHT:
case DFRAC:
case TFRAC:
case OVER:
case ATOP: {
int const dy = axis_height(mi.base);
Changer dummy =
// \tfrac is always in text size
(kind_ == TFRAC) ? mi.base.font.changeStyle(LM_ST_SCRIPT) :
// \cfrac and \dfrac are always in display size
(kind_ == CFRAC
|| kind_ == CFRACLEFT
|| kind_ == CFRACRIGHT
|| kind_ == DFRAC) ? mi.base.font.changeStyle(LM_ST_DISPLAY) :
// all others
mi.base.changeFrac();
Changer dummy2 = mi.base.changeEnsureMath();
cell(0).metrics(mi, dim0);
cell(1).metrics(mi, dim1);
dim.wid = max(dim0.wid, dim1.wid) + 2;
dim.asc = dim0.height() + dy/2 + dy;
int const t = mi.base.solidLineThickness();
dim.des = max(0, dim1.height() + dy/2 - dy + t);
}
} //switch (kind_)
}
void InsetMathFrac::draw(PainterInfo & pi, int x, int y) const
{
Changer dummy3 = pi.base.changeEnsureMath();
Dimension const dim = dimension(*pi.base.bv);
Dimension const dim0 = cell(0).dimension(*pi.base.bv);
switch (kind_) {
case UNIT: {
// \unitone, \unittwo
int xx = x;
int unit_cell = 0;
// is there an extra cell holding the value being given a dimension?
// (this is \unittwo)
if (nargs() == 2) {
cell(0).draw(pi, x, y);
xx += dim0.wid + 4;
unit_cell = 1;
}
Changer dummy = pi.base.font.changeShape(UP_SHAPE);
cell(unit_cell).draw(pi, xx, y);
}
break;
case UNITFRAC:
case NICEFRAC: {
// \unitfrac, \unitfracthree, \nicefrac
int xx = x;
int const dy = dy_for_nicefrac(pi.base);
// is there an extra cell holding the value being given a dimension?
// (this is \unitfracthree)
if (kind_ == UNITFRAC && nargs() == 3) {
cell(2).draw(pi, x, y);
xx += cell(2).dimension(*pi.base.bv).wid + 4;
}
Changer dummy = (kind_ == UNITFRAC) ? pi.base.font.changeShape(UP_SHAPE)
: Changer();
// nice fraction
Changer dummy2 = pi.base.changeScript();
cell(0).draw(pi, xx, y - dy);
// reference LaTeX code from nicefrac.sty:
// \mkern-2mu/\mkern-1mu
if (latexkeys const * slash = slash_symbol()) {
int mkern = mathed_mu(pi.base.font, 2.0);
mathedSymbolDraw(pi, xx + 1 + dim0.wid - mkern, y, slash);
Dimension dimslash;
mathedSymbolDim(pi.base, dimslash, slash);
xx += dimslash.wid - mathed_mu(pi.base.font, 3.0);
}
cell(1).draw(pi, xx + 1 + dim0.wid, y);
}
break;
case FRAC:
case CFRAC:
case CFRACLEFT:
case CFRACRIGHT:
case DFRAC:
case TFRAC:
case OVER:
case ATOP: {
int const dy = axis_height(pi.base);
Changer dummy =
// \tfrac is always in text size
(kind_ == TFRAC) ? pi.base.font.changeStyle(LM_ST_SCRIPT) :
// \cfrac and \dfrac are always in display size
(kind_ == CFRAC
|| kind_ == CFRACLEFT
|| kind_ == CFRACRIGHT
|| kind_ == DFRAC) ? pi.base.font.changeStyle(LM_ST_DISPLAY) :
// all others
pi.base.changeFrac();
Dimension const dim1 = cell(1).dimension(*pi.base.bv);
int const m = x + dim.wid / 2;
int const xx =
// align left
(kind_ == CFRACLEFT) ? x + 1 :
// align right
(kind_ == CFRACRIGHT) ? x + dim.wid - dim0.wid - 2 :
// center
m - dim0.wid / 2;
int const t = pi.base.solidLineThickness();
// take dy/2 for the spacing around the horizontal line. This is
// arbitrary. In LaTeX it is more complicated to ensure that displayed
// fractions line up next to each other.
// For more accurate implementation refer to the TeXbook, Appendix G,
// rules 15a-e.
cell(0).draw(pi, xx, y - dim0.des - dy/2 - dy);
// center
cell(1).draw(pi, m - dim1.wid / 2, y + dim1.asc + dy/2 - dy + t);
// horizontal line
if (kind_ != ATOP)
pi.pain.line(x, y - dy, x + dim.wid - 2, y - dy,
pi.base.font.color(), pi.pain.line_solid, t);
}
} //switch (kind_)
}
void InsetMathFrac::metricsT(TextMetricsInfo const & mi, Dimension & dim) const
{
Dimension dim0, dim1;
cell(0).metricsT(mi, dim0);
cell(1).metricsT(mi, dim1);
dim.wid = max(dim0.width(), dim1.wid);
dim.asc = dim0.height() + 1;
dim.des = dim1.height();
}
void InsetMathFrac::drawT(TextPainter & /*pain*/, int /*x*/, int /*y*/) const
{
// FIXME: BROKEN!
/*
Dimension dim;
int m = x + dim.width() / 2;
cell(0).drawT(pain, m - dim0.width() / 2, y - dim0.des - 1);
cell(1).drawT(pain, m - dim1.wid / 2, y + dim1.asc);
// ASCII art: ignore niceties
if (kind_ == FRAC || kind_ == OVER || kind_ == NICEFRAC || kind_ == UNITFRAC)
pain.horizontalLine(x, y, dim.width());
*/
}
void InsetMathFrac::write(WriteStream & os) const
{
MathEnsurer ensurer(os);
switch (kind_) {
case ATOP:
// \\atop is only for compatibility, \\binom is the
// LaTeX2e successor
os << '{' << cell(0) << "\\atop " << cell(1) << '}';
break;
case OVER:
// \\over is only for compatibility, normalize this to \\frac
os << "\\frac{" << cell(0) << "}{" << cell(1) << '}';
break;
case FRAC:
case DFRAC:
case TFRAC:
case NICEFRAC:
case CFRAC:
case UNITFRAC:
if (nargs() == 2)
InsetMathNest::write(os);
else
os << "\\unitfrac[" << cell(2) << "]{" << cell(0) << "}{" << cell(1) << '}';
break;
case UNIT:
if (nargs() == 2)
os << "\\unit[" << cell(0) << "]{" << cell(1) << '}';
else
os << "\\unit{" << cell(0) << '}';
break;
case CFRACLEFT:
os << "\\cfrac[l]{" << cell(0) << "}{" << cell(1) << '}';
break;
case CFRACRIGHT:
os << "\\cfrac[r]{" << cell(0) << "}{" << cell(1) << '}';
break;
}
}
docstring InsetMathFrac::name() const
{
switch (kind_) {
case FRAC:
return from_ascii("frac");
case CFRAC:
case CFRACLEFT:
case CFRACRIGHT:
return from_ascii("cfrac");
case DFRAC:
return from_ascii("dfrac");
case TFRAC:
return from_ascii("tfrac");
case OVER:
return from_ascii("over");
case NICEFRAC:
return from_ascii("nicefrac");
case UNITFRAC:
return from_ascii("unitfrac");
case UNIT:
return from_ascii("unit");
case ATOP:
return from_ascii("atop");
}
// shut up stupid compiler
return docstring();
}
bool InsetMathFrac::extraBraces() const
{
return kind_ == ATOP || kind_ == OVER;
}
void InsetMathFrac::maple(MapleStream & os) const
{
if (nargs() != 2) {
// Someone who knows about maple should fix this.
LASSERT(false, return);
}
os << '(' << cell(0) << ")/(" << cell(1) << ')';
}
void InsetMathFrac::mathematica(MathematicaStream & os) const
{
if (nargs() != 2) {
// Someone who knows about mathematica should fix this.
LASSERT(false, return);
}
os << '(' << cell(0) << ")/(" << cell(1) << ')';
}
void InsetMathFrac::octave(OctaveStream & os) const
{
if (nargs() != 2) {
// Someone who knows about octave should fix this.
LASSERT(false, return);
}
os << '(' << cell(0) << ")/(" << cell(1) << ')';
}
void InsetMathFrac::mathmlize(MathStream & os) const
{
switch (kind_) {
case ATOP:
os << MTag("mfrac", "linethickeness='0'")
<< MTag("mrow") << cell(0) << ETag("mrow")
<< MTag("mrow") << cell(1) << ETag("mrow")
<< ETag("mfrac");
break;
// we do not presently distinguish these
case OVER:
case FRAC:
case DFRAC:
case TFRAC:
case CFRAC:
case CFRACLEFT:
case CFRACRIGHT:
os << MTag("mfrac")
<< MTag("mrow") << cell(0) << ETag("mrow")
<< MTag("mrow") << cell(1) << ETag("mrow")
<< ETag("mfrac");
break;
case NICEFRAC:
os << MTag("mfrac", "bevelled='true'")
<< MTag("mrow") << cell(0) << ETag("mrow")
<< MTag("mrow") << cell(1) << ETag("mrow")
<< ETag("mfrac");
break;
case UNITFRAC:
if (nargs() == 3)
os << cell(2);
os << MTag("mfrac", "bevelled='true'")
<< MTag("mrow") << cell(0) << ETag("mrow")
<< MTag("mrow") << cell(1) << ETag("mrow")
<< ETag("mfrac");
break;
case UNIT:
// FIXME This is not right, because we still output mi, etc,
// when we output the cell. So we need to prevent that somehow.
if (nargs() == 2)
os << cell(0)
<< MTag("mstyle mathvariant='normal'")
<< cell(1)
<< ETag("mstyle");
else
os << MTag("mstyle mathvariant='normal'")
<< cell(0)
<< ETag("mstyle");
}
}
void InsetMathFrac::htmlize(HtmlStream & os) const
{
switch (kind_) {
case ATOP:
os << MTag("span", "class='frac'")
<< MTag("span", "class='numer'") << cell(0) << ETag("span")
<< MTag("span", "class='numer'") << cell(1) << ETag("span")
<< ETag("span");
break;
// we do not presently distinguish these
case OVER:
case FRAC:
case DFRAC:
case TFRAC:
case CFRAC:
case CFRACLEFT:
case CFRACRIGHT:
os << MTag("span", "class='frac'")
<< MTag("span", "class='numer'") << cell(0) << ETag("span")
<< MTag("span", "class='denom'") << cell(1) << ETag("span")
<< ETag("span");
break;
case NICEFRAC:
os << cell(0) << '/' << cell(1);
break;
case UNITFRAC:
if (nargs() == 3)
os << cell(2) << ' ';
os << cell(0) << '/' << cell(1);
break;
case UNIT:
// FIXME This is not right, because we still output i, etc,
// when we output the cell. So we need to prevent that somehow.
if (nargs() == 2)
os << cell(0)
<< MTag("span")
<< cell(1)
<< ETag("span");
else
os << MTag("span")
<< cell(0)
<< ETag("span");
}
}
void InsetMathFrac::validate(LaTeXFeatures & features) const
{
if (kind_ == NICEFRAC || kind_ == UNITFRAC || kind_ == UNIT)
features.require("units");
if (kind_ == CFRAC || kind_ == CFRACLEFT || kind_ == CFRACRIGHT
|| kind_ == DFRAC || kind_ == TFRAC)
features.require("amsmath");
if (features.runparams().math_flavor == OutputParams::MathAsHTML)
// CSS adapted from eLyXer
features.addCSSSnippet(
"span.frac{display: inline-block; vertical-align: middle; text-align:center;}\n"
"span.numer{display: block;}\n"
"span.denom{display: block; border-top: thin solid #000040;}");
InsetMathNest::validate(features);
}
/////////////////////////////////////////////////////////////////////
//
// InsetMathBinom
//
/////////////////////////////////////////////////////////////////////
InsetMathBinom::InsetMathBinom(Buffer * buf, Kind kind)
: InsetMathFracBase(buf), kind_(kind)
{}
Inset * InsetMathBinom::clone() const
{
return new InsetMathBinom(*this);
}
int InsetMathBinom::dw(int height) const
{
int w = height / 5;
if (w > 15)
w = 15;
if (w < 6)
w = 6;
return w;
}
void InsetMathBinom::metrics(MetricsInfo & mi, Dimension & dim) const
{
Changer dummy2 = mi.base.changeEnsureMath();
Dimension dim0, dim1;
int const dy = axis_height(mi.base);
Changer dummy =
(kind_ == DBINOM) ? mi.base.font.changeStyle(LM_ST_DISPLAY) :
(kind_ == TBINOM) ? mi.base.font.changeStyle(LM_ST_SCRIPT) :
mi.base.changeFrac();
cell(0).metrics(mi, dim0);
cell(1).metrics(mi, dim1);
dim.asc = dim0.height() + 1 + dy/2 + dy;
dim.des = max(0, dim1.height() + 1 + dy/2 - dy);
dim.wid = max(dim0.wid, dim1.wid) + 2 * dw(dim.height()) + 4;
}
void InsetMathBinom::draw(PainterInfo & pi, int x, int y) const
{
Changer dummy2 = pi.base.changeEnsureMath();
Dimension const dim = dimension(*pi.base.bv);
Dimension const & dim0 = cell(0).dimension(*pi.base.bv);
Dimension const & dim1 = cell(1).dimension(*pi.base.bv);
int const dy = axis_height(pi.base);
// define the binom brackets
docstring const bra = kind_ == BRACE ? from_ascii("{") :
kind_ == BRACK ? from_ascii("[") : from_ascii("(");
docstring const ket = kind_ == BRACE ? from_ascii("}") :
kind_ == BRACK ? from_ascii("]") : from_ascii(")");
int m = x + dim.width() / 2;
{
Changer dummy =
(kind_ == DBINOM) ? pi.base.font.changeStyle(LM_ST_DISPLAY) :
(kind_ == TBINOM) ? pi.base.font.changeStyle(LM_ST_SCRIPT) :
pi.base.changeFrac();
// take dy both for the vertical alignment and for the spacing between
// cells
cell(0).draw(pi, m - dim0.wid / 2, y - dim0.des - dy/2 - dy);
cell(1).draw(pi, m - dim1.wid / 2, y + dim1.asc + dy/2 - dy);
}
// draw the brackets and the marker
mathed_draw_deco(pi, x, y - dim.ascent(), dw(dim.height()),
dim.height(), bra);
mathed_draw_deco(pi, x + dim.width() - dw(dim.height()),
y - dim.ascent(), dw(dim.height()), dim.height(), ket);
}
bool InsetMathBinom::extraBraces() const
{
return kind_ == CHOOSE || kind_ == BRACE || kind_ == BRACK;
}
void InsetMathBinom::write(WriteStream & os) const
{
MathEnsurer ensurer(os);
switch (kind_) {
case BINOM:
os << "\\binom{" << cell(0) << "}{" << cell(1) << '}';
break;
case DBINOM:
os << "\\dbinom{" << cell(0) << "}{" << cell(1) << '}';
break;
case TBINOM:
os << "\\tbinom{" << cell(0) << "}{" << cell(1) << '}';
break;
case CHOOSE:
os << '{' << cell(0) << " \\choose " << cell(1) << '}';
break;
case BRACE:
os << '{' << cell(0) << " \\brace " << cell(1) << '}';
break;
case BRACK:
os << '{' << cell(0) << " \\brack " << cell(1) << '}';
break;
}
}
void InsetMathBinom::normalize(NormalStream & os) const
{
os << "[binom " << cell(0) << ' ' << cell(1) << ']';
}
void InsetMathBinom::mathmlize(MathStream & os) const
{
char ldelim = ' ';
char rdelim = ' ';
switch (kind_) {
case BINOM:
case TBINOM:
case DBINOM:
case CHOOSE:
ldelim = '(';
rdelim = ')';
break;
case BRACE:
ldelim = '{';
rdelim = '}';
break;
case BRACK:
ldelim = '[';
rdelim = ']';
break;
}
os << "<mo fence='true' stretchy='true' form='prefix'>" << ldelim << "</mo>"
<< "<mfrac linethickness='0'>"
<< cell(0) << cell(1)
<< "</mfrac>"
<< "<mo fence='true' stretchy='true' form='postfix'>" << rdelim << "</mo>";
}
void InsetMathBinom::htmlize(HtmlStream & os) const
{
char ldelim = ' ';
char rdelim = ' ';
switch (kind_) {
case BINOM:
case TBINOM:
case DBINOM:
case CHOOSE:
ldelim = '(';
rdelim = ')';
break;
case BRACE:
ldelim = '{';
rdelim = '}';
break;
case BRACK:
ldelim = '[';
rdelim = ']';
break;
}
os << MTag("span", "class='binomdelim'") << ldelim << ETag("span") << '\n'
<< MTag("span", "class='binom'") << '\n'
<< MTag("span") << cell(0) << ETag("span") << '\n'
<< MTag("span") << cell(1) << ETag("span") << '\n'
<< ETag("span") << '\n'
<< MTag("span", "class='binomdelim'") << rdelim << ETag("span") << '\n';
}
void InsetMathBinom::validate(LaTeXFeatures & features) const
{
if (features.runparams().isLaTeX()) {
if (kind_ == BINOM)
features.require("binom");
if (kind_ == DBINOM || kind_ == TBINOM)
features.require("amsmath");
} else if (features.runparams().math_flavor == OutputParams::MathAsHTML)
features.addCSSSnippet(
"span.binom{display: inline-block; vertical-align: bottom; text-align:center;}\n"
"span.binom span{display: block;}\n"
"span.binomdelim{font-size: 2em;}");
InsetMathNest::validate(features);
}
} // namespace lyx
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