When handling WM_NCCALCSIZE, we reduce the size of the client area when
the window is maximised. If we don't do this, then the client area
matches the top-level window area, which is larger than the display's
safe area. As a result, the window appears too large, and the edges are
obscured under the edges of the display.
After reducing the client area in WM_NCCALCSIZE, the client area is no
longer equal to the top-level window area, so getBounds() must be
updated to return the window's *client* area rather than the top-level
window area.
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