From 0090af19d321991487a61a068e4547d091eafda0 Mon Sep 17 00:00:00 2001
From: Guillaume Munch <gm@lyx.org>
Date: Mon, 1 Aug 2016 20:50:46 +0100
Subject: [PATCH] Fix aliasing logic for polylines

---
 src/frontends/qt4/GuiPainter.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/frontends/qt4/GuiPainter.cpp b/src/frontends/qt4/GuiPainter.cpp
index 5762c9b958..65d95f69bf 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 {