improve unicode handling when setting Start page

src/Mod/Web/CMakeLists.txt

@@ -3,6 +3,7 @@ add_subdirectory(App)
 
 set(Web_Scripts
     Init.py
+    TestWebGui.py
 )
 
 if(BUILD_GUI)

src/Mod/Web/Gui/BrowserView.cpp

@@ -119,10 +119,14 @@ Py::Object BrowserViewPy::setHtml(const Py::Tuple& args)
 {
     char* HtmlCode;
     char* BaseUrl;
-    if (! PyArg_ParseTuple(args.ptr(), "ss",&HtmlCode,&BaseUrl))
+    if (!PyArg_ParseTuple(args.ptr(), "et|s","utf-8",&HtmlCode,&BaseUrl))
         throw Py::Exception();
+
+    std::string EncodedHtml = std::string(HtmlCode);
+    PyMem_Free(HtmlCode);
+
     if (myWebView)
-        myWebView->setHtml(QString::fromUtf8(HtmlCode),QUrl(QString::fromLatin1(BaseUrl)));
+        myWebView->setHtml(QString::fromUtf8(EncodedHtml.c_str()), QUrl(QString::fromLatin1(BaseUrl)));
     return Py::None();
 }
 }

src/Mod/Web/InitGui.py

@@ -46,3 +46,5 @@ class WebWorkbench ( Workbench ):
         return "WebGui::Workbench"
 
 Gui.addWorkbench(WebWorkbench())
+
+FreeCAD.__unit_test__ += [ "TestWebGui" ]

src/Mod/Web/TestWebGui.py

@@ -0,0 +1,28 @@
+#   Copyright (c) 2018 Werner Mayer <wmayer[at]users.sourceforge.net>     *
+#                                                                         *
+#   This file is part of the FreeCAD CAx development system.              *
+#                                                                         *
+#   This program is free software; you can redistribute it and/or modify  *
+#   it under the terms of the GNU Lesser General Public License (LGPL)    *
+#   as published by the Free Software Foundation; either version 2 of     *
+#   the License, or (at your option) any later version.                   *
+#   for detail see the LICENCE text file.                                 *
+#                                                                         *
+#   FreeCAD is distributed in the hope that it will be useful,            *
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+#   GNU Library General Public License for more details.                  *
+#                                                                         *
+#   You should have received a copy of the GNU Library General Public     *
+#   License along with FreeCAD; if not, write to the Free Software        *
+#   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
+#   USA                                                                   *
+#**************************************************************************
+
+import FreeCAD, os, sys, unittest, WebGui
+
+class WebGuiTestCases(unittest.TestCase):
+    def testHtmlCase(self):
+        bytestr=b'<b>Fran\xc3\xa7ais</b>'
+        browser=WebGui.openBrowserWindow('Browser')
+        browser.setHtml(bytestr.decode("utf8"), FreeCAD.getResourceDir())