Revert "Document WS_EX_COMPOSITED impact on wxClientDC"

This reverts commit b0ed71658d.

interface/wx/dcclient.h

@@ -47,11 +47,11 @@ public:
 
     @note While wxClientDC may also be used for drawing on the client area of a
     window from outside an EVT_PAINT() handler in some ports, this does @em not
-    work on most of the platforms: neither wxOSX nor wxGTK with GTK 3 Wayland
-    backend support this at all, so drawing using wxClientDC simply doesn't
-    have any effect there. CanBeUsedForDrawing() can be used to determine
-    whether wxClientDC can be used for drawing in the current environment, but
-    it is recommended to only draw on the window using wxPaintDC, as this is
+    work on all platforms: neither wxOSX nor wxGTK with GTK 3 Wayland backend
+    support this at all, so drawing using wxClientDC simply doesn't have any
+    effect there. CanBeUsedForDrawing() can be used to determine whether
+    wxClientDC can be used for drawing in the current environment, but it is
+    recommended to only draw on the window using wxPaintDC, as this is
     guaranteed to work everywhere. To redraw a small part of the window, use
     wxWindow::RefreshRect() to invalidate just this part and check
     wxWindow::GetUpdateRegion() in the paint event handler to redraw this part

interface/wx/window.h

@@ -4315,39 +4315,6 @@ public:
     ///@}
 
 
-    /**
-        Disable the use native double buffering in wxMSW.
-
-        This MSW-specific function can be used to disable the use of
-        `WS_EX_COMPOSITED` for this window and all of its parents and so allow
-        using wxClientDC with it.
-
-        `WS_EX_COMPOSITED` style is turned on by default when creating the
-        windows and it is strongly recommended @e not to use this functions to
-        remove it, but to instead change the drawing code to avoid using
-        wxClientDC.
-
-        If you do need to use it, please note that this function doesn't exist
-        in the other ports and has to be explicitly bracketed by the checks for
-        wxMSW, e.g.
-        @code
-        MyFrame::MyFrame(...)
-        {
-            auto p = new wxPanel(this);
-        #ifdef __WXMSW__
-            p->MSWDisableComposited();
-        #endif
-
-            // Using wxClientDC will work now with this panel in wxMSW --
-            // although it still won't with wxOSX nor wxGTK under Wayland.
-        }
-        @endcode
-
-        @see wxClientDC
-
-        @since 3.3.0
-     */
-    void MSWDisableComposited();
 
 protected: