richedit: Prevent EN_UPDATE notifications when window isn't visible.

dlls/riched20/paint.c

@@ -147,6 +147,8 @@ void ME_Repaint(ME_TextEditor *editor)
     ME_UpdateScrollBar(editor);
     FIXME("ME_Repaint had to call ME_WrapMarkedParagraphs\n");
   }
+  if (!IsWindowVisible(editor->hWnd))
+    return;
   if (!editor->bEmulateVersion10 || (editor->nEventMask & ENM_UPDATE))
     ME_SendOldNotify(editor, EN_UPDATE);
   UpdateWindow(editor->hWnd);

dlls/riched20/tests/editor.c

@@ -5205,7 +5205,7 @@ static void test_eventMask(void)
     watchForEventMask = EN_UPDATE;
     queriedEventMask = 0;  /* initialize to something other than we expect */
     SendMessage(eventMaskEditHwnd, EM_REPLACESEL, 0, (LPARAM) text);
-    todo_wine ok(queriedEventMask == 0,
+    ok(queriedEventMask == 0,
             "wrong event mask (0x%x) during WM_COMMAND\n", queriedEventMask);
     SetWindowLong(eventMaskEditHwnd, GWL_STYLE, style);
     ok(IsWindowVisible(eventMaskEditHwnd), "Window should be visible.\n");