Comment 34 for bug 1854183

But the "invisible" window, when unmaximized, turns into zero-size window mentioned in bug 125543. So they may be somehow related. It may be that during opening a CSV file while Calc window is maximized it's size is internally changed to 0 and this causes both the "invisible" window (it somehow still remembers the maximized state, but due to zero size nothing is shown) and the zero size window after unmaximizing.