riched20: Don't call UpdateWindow after setting the background color.

dlls/riched20/editor.c

@@ -3664,7 +3664,6 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
       editor->hbrBackground = CreateSolidBrush(editor->rgbBackColor);
     }
     ITextHost_TxInvalidateRect(editor->texthost, NULL, TRUE);
-    ITextHost_TxViewChange(editor->texthost, TRUE);
     return lColor;
   }
   case EM_GETMODIFY:

dlls/riched20/tests/editor.c

@@ -8153,6 +8153,18 @@ static void test_alignment_style(void)
     DestroyWindow(richedit);
 }
 
+static void test_background(void)
+{
+    HWND hwndRichEdit = new_richedit(NULL);
+
+    /* set the background color to black */
+    ValidateRect(hwndRichEdit, NULL);
+    SendMessageA(hwndRichEdit, EM_SETBKGNDCOLOR, FALSE, RGB(0, 0, 0));
+    ok(GetUpdateRect(hwndRichEdit, NULL, FALSE), "Update rectangle is empty!\n");
+
+    DestroyWindow(hwndRichEdit);
+}
+
 START_TEST( editor )
 {
   BOOL ret;
@@ -8220,6 +8232,7 @@ START_TEST( editor )
   test_EM_SETREADONLY();
   test_EM_SETFONTSIZE();
   test_alignment_style();
+  test_background();
 
   /* Set the environment variable WINETEST_RICHED20 to keep windows
    * responsive and open for 30 seconds. This is useful for debugging.