Propagate wxHtmlWindow layout direction to the wxDC it uses.

While wxHtmlWindow doesn't support mixing LTR and RTL contents we can indeed
try to make it render pure RTL stuff correctly by setting up the wxDC used for
drawing accordingly.

Closes #1988.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65063 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -411,6 +411,7 @@ MSW:
 All (GUI):
 
 - wxAUI: support auto-orientable toolbars (wsu).
+- wxHTML: render in RTL order inside RTL window (Richard Bullington-McGuire).
 - Add support for CP-866 encoding to wxEncodingConverter (madnut).
 
 

src/html/htmlwin.cpp

@@ -1149,6 +1149,7 @@ void wxHtmlWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
     // draw the HTML window contents
     dc->SetMapMode(wxMM_TEXT);
     dc->SetBackgroundMode(wxBRUSHSTYLE_TRANSPARENT);
+    dc->SetLayoutDirection(GetLayoutDirection());
 
     wxHtmlRenderingInfo rinfo;
     wxDefaultHtmlRenderingStyle rstyle;