Execute "runemacs --fullscreen" at a Windows command prompt. I would
expect that Emacs would open filling the screen, more or less, apart
from the taskbar, but it doesn't. The Emacs window is about 20% too
short, it is the width of the full screen but hides under the taskbar
(which I have along the right side) and the top left corner of the
window is below and to the right of the top left corner of the screen.
Replacing "--fullscreen" with "--maximized" behaves similarly and the
window is certainly not maximized because I can still maximize it by
clicking on the maximize button at the top right corner of the window.
If I add "-q" or "-Q" to the command line then "--fullscreen" and
"--maximized" both seem to be ignored completely, with one exception:
"runemacs -q --fullscreen" and "runemacs -q --maximized" both cause the
Emacs logo to be positioned at the right side of the window so that half
of it is outside the window, instead of being centred.