uxtheme: Implement GetBufferedPaintTargetDC().

dlls/uxtheme/buffer.c

@@ -211,10 +211,13 @@ HDC WINAPI GetBufferedPaintDC(HPAINTBUFFER bufferhandle)
 /***********************************************************************
  *      GetBufferedPaintTargetDC                           (UXTHEME.@)
  */
-HDC WINAPI GetBufferedPaintTargetDC(HPAINTBUFFER hBufferedPaint)
+HDC WINAPI GetBufferedPaintTargetDC(HPAINTBUFFER bufferhandle)
 {
-    FIXME("Stub (%p)\n", hBufferedPaint);
-    return NULL;
+    struct paintbuffer *buffer = get_buffer_obj(bufferhandle);
+
+    TRACE("(%p)\n", buffer);
+
+    return buffer ? buffer->targetdc : NULL;
 }
 
 /***********************************************************************

dlls/uxtheme/tests/system.c

@@ -617,7 +617,6 @@ todo_wine
     ok(hdc == src, "Unexpected hdc, %p, buffered dc %p\n", hdc, src);
 
     hdc = pGetBufferedPaintTargetDC(buffer);
-todo_wine
     ok(hdc == target, "Unexpected target hdc %p, original %p\n", hdc, target);
 
     hr = pGetBufferedPaintTargetRect(buffer, NULL);