[LyX/master] Fix #5760 also on Windows.

[Enrico Forestieri]

commit 6e6abe1edd8af041967c842b9604fb3b797b68ff
Author: Enrico Forestieri <for...@lyx.org>
Date:   Tue May 5 01:33:16 2015 +0200

    Fix #5760 also on Windows.
    
    The problem was due to the use of the wrong symbol for the slash.
    The zero-width symbol for the \not operator was being used.
    Using TeX fonts for all symbols gives now a better uniform look.
    It is not possible using the alternative code even with Qt 5.4.1
    because some glyphs are still missing.

diff --git a/src/frontends/qt4/GuiDelimiter.cpp 
b/src/frontends/qt4/GuiDelimiter.cpp
index 2df0c01..c1a4f90 100644
--- a/src/frontends/qt4/GuiDelimiter.cpp
+++ b/src/frontends/qt4/GuiDelimiter.cpp
@@ -100,14 +100,14 @@ void initMathSymbols()
        // defined with non-unicode ids for use within mathed.
        // FIXME 2: We should fill-in this map with the parsed "symbols"
        // file done in MathFactory.cpp.
-       math_symbols_["("] = MathSymbol('(');
-       math_symbols_[")"] = MathSymbol(')');
-       math_symbols_["{"] = MathSymbol('{');
-       math_symbols_["}"] = MathSymbol('}');
-       math_symbols_["["] = MathSymbol('[');
-       math_symbols_["]"] = MathSymbol(']');
-       math_symbols_["|"] = MathSymbol('|');
-       math_symbols_["/"] = MathSymbol('/', 54, CMSY_FAMILY);
+       math_symbols_["("] = MathSymbol('(', 40, CMR_FAMILY);
+       math_symbols_[")"] = MathSymbol(')', 41, CMR_FAMILY);
+       math_symbols_["{"] = MathSymbol('{', 102, CMSY_FAMILY);
+       math_symbols_["}"] = MathSymbol('}', 103, CMSY_FAMILY);
+       math_symbols_["["] = MathSymbol('[', 91, CMR_FAMILY);
+       math_symbols_["]"] = MathSymbol(']', 93, CMR_FAMILY);
+       math_symbols_["|"] = MathSymbol('|', 106, CMSY_FAMILY);
+       math_symbols_["/"] = MathSymbol('/', 47, CMR_FAMILY);
        math_symbols_["backslash"] = MathSymbol('\\', 110, CMSY_FAMILY);
        math_symbols_["lceil"] = MathSymbol(0x2308, 100, CMSY_FAMILY);
        math_symbols_["rceil"] = MathSymbol(0x2309, 101, CMSY_FAMILY);
@@ -189,9 +189,11 @@ GuiDelimiter::GuiDelimiter(GuiView & lv)
                string const delim = latex_delimiters[i];
                MathSymbol const & ms = mathSymbol(delim);
 // Due to a bug in Qt 4 on Windows, we need to use our math symbol font
-// on Windows, which results in sub-optimal glyph display (see #5760).
+// on Windows (see #5760).
 // FIXME: Re-check after Windows has settled to Qt 5.
-#if defined(_WIN32)
+//        ATM, this doesn't work also with Qt 5.4.1 because of still missing
+//        glyphs for \llbracket and \rrbracket.
+#if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
                QString symbol(ms.fontcode?
                        QChar(ms.fontcode) : toqstr(docstring(1, ms.unicode)));
                QListWidgetItem * lwi = new QListWidgetItem(symbol);
@@ -221,7 +223,7 @@ GuiDelimiter::GuiDelimiter(GuiView & lv)
        QListWidgetItem * rwi = new QListWidgetItem(qt_("(None)"));
 // See above comment.
 // FIXME: Re-check after Windows has settled to Qt 5.
-#if !defined(_WIN32)
+#if !defined(Q_OS_WIN) && !defined(Q_CYGWIN_WIN)
        QFont font = lwi->font();
        font.setPointSize(2 * font.pointSize());
        lwi->setFont(font);