Improve RTL support in wxStyledTextCtrl.

Use the correct HDC, inheriting the right text orientation, when creating
wxMemoryDC in SurfaceImpl code.

There may still be problems with the actual RTL languages, but at the very
least English text displayed in RTL locale is not mirrored any more.

Closes #16230.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76493 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -46,6 +46,7 @@ All (GUI):
 - Add wxFont::GetBaseFont() (Melroy Tellis).
 - Update included Scintilla to version 3.3.9 (Christian Walther).
 - Add wxStyledTextCtrl copy/paste text events (Christian Walther).
+- Improve RTL support in wxStyledTextCtrl (Zane U. Ji).
 - Add support for loading old V1 BMP files to wxImage (Artur Wieczorek).
 - Improve auto sizing of wrapped cells in wxGrid (iwbnwif).
 - Fix handling of rectangular selections in wxStyledTextCtrl (roberto).

src/stc/PlatWX.cpp

@@ -211,9 +211,12 @@ void SurfaceImpl::Init(SurfaceID hdc_, WindowID) {
     hdc = (wxDC*)hdc_;
 }
 
-void SurfaceImpl::InitPixMap(int width, int height, Surface *WXUNUSED(surface_), WindowID winid) {
+void SurfaceImpl::InitPixMap(int width, int height, Surface *surface, WindowID winid) {
     Release();
-    hdc = new wxMemoryDC();
+    if (surface)
+        hdc = new wxMemoryDC(static_cast<SurfaceImpl*>(surface)->hdc);
+    else
+        hdc = new wxMemoryDC();
     hdcOwned = true;
     if (width < 1) width = 1;
     if (height < 1) height = 1;