Fix to commit 03568b2e

During a rebase I accidentally removed the VirtualDevice::EnableRTL().
Also taking the opportunity to make the function virtual in window.hxx.

Change-Id: Ic239d8dc131dfcc6b049c30d2fad4d2d12059059
Reviewed-on: https://gerrit.libreoffice.org/8745Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

include/vcl/virdev.hxx

@@ -113,7 +113,7 @@ public:
 
     virtual             ~VirtualDevice();
 
-    void                EnableRTL( bool bEnable = true );
+    virtual void        EnableRTL( bool bEnable = true );
 
     bool                SetOutputSizePixel( const Size& rNewSize, bool bErase = true );
     bool                SetOutputSizePixelScaleOffsetAndBuffer( const Size& rNewSize, const Fraction& rScale, const Point& rNewOffset, const basebmp::RawMemorySharedArray &pBuffer );

vcl/source/gdi/virdev.cxx

@@ -422,6 +422,18 @@ bool VirtualDevice::ImplSetOutputSizePixel( const Size& rNewSize, bool bErase, c
     return false;
 }
 
+void VirtualDevice::EnableRTL( bool bEnable )
+{
+    // virdevs default to not mirroring, they will only be set to mirroring
+    // under rare circumstances in the UI, eg the valueset control
+    // because each virdev has its own SalGraphics we can safely switch the SalGraphics here
+    // ...hopefully
+    if( ImplGetGraphics() )
+        mpGraphics->SetLayout( bEnable ? SAL_LAYOUT_BIDI_RTL : 0 );
+
+    OutputDevice::EnableRTL(bEnable);
+}
+
 bool VirtualDevice::SetOutputSizePixel( const Size& rNewSize, bool bErase )
 {
     return ImplSetOutputSizePixel( rNewSize, bErase, basebmp::RawMemorySharedArray() );