Tooltip for memory table flashing in windows

In windows 10, the tooltips for memory table is keep flashing while debugging, it's very annoying.

I‘ve checked QToolTip::isVisible() before QToolTip::showText() called in setCellValue(), and it's always false.

I have no idea why this happens. I've tried to don't call table item's setData() and setSelected() if not necessary, but QToolTip::isVisible() is still false.

So maybe it's better to comment this function off for windows?

I Think it is more or less working at Rev 1917.