[0.4.13][WIN32SS] Fix Opaque Text Fade while in Desktop Startup

This fixes CORE-16498, which got considerably more severe by
0.4.13-dev-209-g
dc7f4f682f

Thanks to the patches author Jim Tabor.
I merged manually analog 0.4.14-dev-594-g
5214a38fd0

win32ss/gdi/gdi32/objects/region.c

@@ -64,7 +64,6 @@ FASTCALL
 DeleteRegion(
     _In_ HRGN hrgn)
 {
-#if 0
     PRGN_ATTR Rgn_Attr = GdiGetRgnAttr(hrgn);
 
     if ( Rgn_Attr )
@@ -78,7 +77,6 @@ DeleteRegion(
             return TRUE;
         }
     }
-#endif
     return NtGdiDeleteObjectApp(hrgn);
 }
 

win32ss/gdi/ntgdi/dclife.c

@@ -949,9 +949,6 @@ BOOL
 APIENTRY
 NtGdiDeleteObjectApp(HANDLE hobj)
 {
-    /* Complete all pending operations */
-    //NtGdiFlushUserBatch(); // FIXME: We shouldn't need this
-
     if (GDI_HANDLE_IS_STOCKOBJ(hobj)) return TRUE;
 
     if (GreGetObjectOwner(hobj) != GDI_OBJ_HMGR_POWNED)

win32ss/user/rtl/text.c

@@ -1374,7 +1374,8 @@ INT WINAPI DrawTextExWorker( HDC hdc,
 #ifndef _WIN32K_
     if (!(flags & DT_NOCLIP) )
     {
-       SelectClipRgn(hdc, hrgn);
+       SelectClipRgn(hdc, hrgn); // This should be NtGdiExtSelectClipRgn, but due to ReactOS build rules this option is next:
+       GdiFlush();               // Flush the batch and level up! See CORE-16498.
        if (hrgn)
        {
           DeleteObject(hrgn);