fdo#67660: Fix memory mismanagement crash

The CTLayout constructor called CFRetain() on the associated
CTTextStyle's attribute directory (a CFMutableDictionaryRef) and the
destructor then called CFRelease() on it, even if there was no
guarantee it was still the same CTTextStyle. And in the scenario that
caused this crash, AquaSalGraphics::SetFont() had in fact deleted the
original CTTextStyle and created a new one.

It seems to me that these CFRetain() and CFRelease() calls are not
necessary.

Change-Id: I18e03965dd05d450955353f8c48f111c19a069e3

vcl/coretext/ctlayout.cxx

@@ -81,7 +81,6 @@ CTLayout::CTLayout( const CTTextStyle* pTextStyle )
 ,   mfCachedWidth( -1 )
 ,   mfBaseAdv( 0 )
 {
-    CFRetain( mpTextStyle->GetStyleDict() );
 }
 
 // -----------------------------------------------------------------------
@@ -92,7 +91,6 @@ CTLayout::~CTLayout()
         CFRelease( mpCTLine );
     if( mpAttrString )
         CFRelease( mpAttrString );
-    CFRelease( mpTextStyle->GetStyleDict() );
 }
 
 // -----------------------------------------------------------------------
@@ -115,6 +113,7 @@ bool CTLayout::LayoutText( ImplLayoutArgs& rArgs )
 
     // create the CoreText line layout
     CFStringRef aCFText = CFStringCreateWithCharactersNoCopy( NULL, rArgs.mpStr + mnMinCharPos, mnCharCount, kCFAllocatorNull );
+    // CFAttributedStringCreate copies the attribues parameter
     mpAttrString = CFAttributedStringCreate( NULL, aCFText, mpTextStyle->GetStyleDict() );
     mpCTLine = CTLineCreateWithAttributedString( mpAttrString );
     CFRelease( aCFText);