[Libreoffice] Decoview: improve comment about checkmark mirroring

This patch improve the comments related to checkmark mirroring: it seems 
to be needed to compensate the lower level mirroring performed by a 
device with mirrored graphics.
Please verify that I understood correctly the code (can graphics really 
be mirrored at a lower level?) and take into account that, according to 
RTL people [1], checkmarks are drawn the same in LTR/RTL languages.

Matteo

[1] Lior Kaplan and Khaled Hosny in the thread "Remember the RTL 
interface", dated 11/29/2011.
From b94d39b77efb96d20a94292f4e842bdb87223ae4 Mon Sep 17 00:00:00 2001
From: Matteo Casalin <matteo.casalin@poste.it>
Date: Sun, 4 Dec 2011 23:55:56 +0100
Subject: [PATCH 2/2] DecoView - a more descriptive comment about mirroring
 issues with checkmarks

---
 vcl/source/window/decoview.cxx |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/vcl/source/window/decoview.cxx b/vcl/source/window/decoview.cxx
index 1958cd6..c249a86 100644
--- a/vcl/source/window/decoview.cxx
+++ b/vcl/source/window/decoview.cxx
@@ -339,6 +339,8 @@ void ImplDrawSymbol( OutputDevice* pDev, Rectangle nRect, const SymbolType eType
                 // #106953# never mirror checkmarks
                 if ( pDev->ImplHasMirroredGraphics() && pDev->IsRTLEnabled() )
                 {
+                    // Draw a mirrored checkmark so that it looks "normal" in a
+                    // mirrored graphics device (double mirroring!)
                     pDev->DrawLine( Point( nRect.Right(), nRect.Bottom()-n3 ),
                                     Point( nRect.Right()-n3, nRect.Bottom() ) );
                     pDev->DrawLine( Point( nRect.Right()-n3, nRect.Bottom() ),
-- 
1.7.5.4