tdf#92577 sw rendercontext: paint transparent from controls conditionally

Regression from commit beb4aa21
(SwViewShell::ImplEndAction: avoid direct paint, 2015-06-29), the
problem was that the lcl_PaintTransparentFormControls() call performs
direct paint, so it should be called only in case we don't do an async
paint via invalidate.

As expected, this call is no longer needed for the original i#107365
bug document in case SwViewShell::Paint() will be called by the main
loop shortly.

Change-Id: Ia27c551ed838d610f972f20abbb4ae9f0e1241b6
(cherry picked from commit 2b26c179)

sw/source/core/view/viewsh.cxx

@@ -407,8 +407,8 @@ void SwViewShell::ImplEndAction( const bool bIdleEnd )
                     {
                         InvalidateWindows(aRect.SVRect());
                     }
-
-                    lcl_PaintTransparentFormControls(*this, aRect); // i#107365
+                    else
+                        lcl_PaintTransparentFormControls(*this, aRect); // i#107365
                 }
 
                 pVout.disposeAndClear();