[Development] Why doesn't xcb platform plugin use _NET_WM_STATE_HIDDEN?

[Thomas Søndergaard]

Why doesn't the XCB platform plugin use _NET_WM_STATE_HIDDEN? There are a
number of bugs related to it QTBUG-31117, QTBUG-39376, QTBUG-34430 and the
commit that address them (commit 382b7afbe253) uses the old WM_STATE.

I am looking at this because I'm trying to fix QTBUG-57882 which is about
the lack of support for setting the full window state on the native window
from Qt, so the programmer cannot programmatically set both minimized and
maximized state on a window at the same time, despite that being a
perfectly valid thing to do.

Thomas
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