[LyX/master] Fix aliasing logic for polylines

[Guillaume Munch]

commit 0090af19d321991487a61a068e4547d091eafda0
Author: Guillaume Munch <g...@lyx.org>
Date:   Mon Aug 1 20:50:46 2016 +0100

    Fix aliasing logic for polylines
---
 src/frontends/qt4/GuiPainter.cpp |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/frontends/qt4/GuiPainter.cpp b/src/frontends/qt4/GuiPainter.cpp
index 5762c9b..65d95f6 100644
--- a/src/frontends/qt4/GuiPainter.cpp
+++ b/src/frontends/qt4/GuiPainter.cpp
@@ -213,7 +213,7 @@ void GuiPainter::lines(int const * xp, int const * yp, int 
np,
        if (np > points.size())
                points.resize(2 * np);
 
-       bool antialias = ls != line_solid_aliased;
+       bool antialias = false;
        for (int i = 0; i < np; ++i) {
                points[i].setX(xp[i]);
                points[i].setY(yp[i]);
@@ -223,7 +223,8 @@ void GuiPainter::lines(int const * xp, int const * yp, int 
np,
        QColor const color = computeColor(col);
        setQPainterPen(color, ls, lw);
        bool const text_is_antialiased = renderHints() & TextAntialiasing;
-       setRenderHint(Antialiasing, antialias && text_is_antialiased);
+       setRenderHint(Antialiasing,
+                     antialias && text_is_antialiased && ls != 
line_solid_aliased);
        if (fs == fill_none) {
                drawPolyline(points.data(), np);
        } else {