Enable looking up colors in the X11 color database.

FEATURE:138740
FIXED-IN:4.9.0

src/ColorSchemeManager.cpp

@@ -157,6 +157,10 @@ bool KDE3ColorSchemeReader::readTitleLine(const QString& line, ColorScheme* sche
 ColorSchemeManager::ColorSchemeManager()
     : _haveLoadedAll(false)
 {
+#ifdef Q_WS_X11
+    // Allow looking up colors in the X11 color database
+    QColor::setAllowX11ColorNames(true);
+#endif
 }
 
 ColorSchemeManager::~ColorSchemeManager()