[LyX/master] Remove special code for Qt5 to manage HiDPI. It's not needed anymore and leads to strange icon scaling problems in mixed resolution environment. For reference see the screen shots in bug tracker ticket #10114.

[Richard Heck]

commit d5fb80ed874057da0d0b31b836052b9fa35ba269
Author: Stephan Witt <sw...@lyx.org>
Date:   Sat May 7 09:56:03 2016 +0200

    Remove special code for Qt5 to manage HiDPI. It's not needed anymore and 
leads to strange icon scaling problems in mixed resolution environment.
    For reference see the screen shots in bug tracker ticket #10114.

diff --git a/src/frontends/qt4/GuiApplication.cpp 
b/src/frontends/qt4/GuiApplication.cpp
index d64c961..9c7c288 100644
--- a/src/frontends/qt4/GuiApplication.cpp
+++ b/src/frontends/qt4/GuiApplication.cpp
@@ -553,18 +553,7 @@ QString iconName(FuncRequest const & f, bool unknown)
 
 bool getPixmap(QPixmap & pixmap, QString const & path)
 {
-       if (pixmap.load(path)) {
-#if QT_VERSION >= 0x050000
-               if (path.endsWith(".svgz") || path.endsWith(".svg") ) {
-                       GuiApplication const * guiApp = theGuiApp();
-                       if (guiApp != 0) {
-                               
pixmap.setDevicePixelRatio(guiApp->pixelRatio());
-                       }
-               }
-#endif
-               return true;
-       }
-       return false;
+       return pixmap.load(path);
 }