remove unused ShowFlags::NoParentUpdate

Change-Id: Id63e1d73643a18d823dfcb35479f0f8eb3e20b15
Reviewed-on: https://gerrit.libreoffice.org/63972
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

compilerplugins/clang/unusedenumconstants.readonly.results

@@ -1096,8 +1096,6 @@ include/vcl/wall.hxx:44
     enum WallpaperStyle Bottom
 include/vcl/window.hxx:121
     enum TrackingEventFlags DontCallHdl
-include/vcl/window.hxx:172
-    enum ShowFlags NoParentUpdate
 include/xmloff/shapeexport.hxx:53
     enum XMLShapeExportFlags WIDTH
 include/xmloff/shapeexport.hxx:54

include/vcl/window.hxx

@@ -169,14 +169,13 @@ namespace o3tl
 enum class ShowFlags
 {
     NONE                       = 0x0000,
-    NoParentUpdate             = 0x0001,
     NoFocusChange              = 0x0002,
     NoActivate                 = 0x0004,
     ForegroundTask             = 0x0008,
 };
 namespace o3tl
 {
-    template<> struct typed_flags<ShowFlags> : is_typed_flags<ShowFlags, 0x000f> {};
+    template<> struct typed_flags<ShowFlags> : is_typed_flags<ShowFlags, 0x000e> {};
 }
 
 // Flags for SetZOrder()

vcl/source/window/window.cxx

@@ -2232,7 +2232,7 @@ void Window::Show(bool bVisible, ShowFlags nFlags)
                     aBounds.AdjustBottom(workaround_border );
                     aInvRegion = aBounds;
                 }
-                if ( !mpWindowImpl->mbNoParentUpdate && !(nFlags & ShowFlags::NoParentUpdate) )
+                if ( !mpWindowImpl->mbNoParentUpdate )
                 {
                     if ( !aInvRegion.IsEmpty() )
                         ImplInvalidateParentFrameRegion( aInvRegion );