Changes

Bug 1249 - NEWT X11: setVisible(*) _NET_WM_STATE_HIDDEN update not
received at ConfigureNotify event (2)
On gnome shell WM, sometimes KDE WM, it has been observed that the
_NET_WM_STATE_HIDDEN update (visible or invisible) is not received at
ConfigureNotify event.
Turns out the state is finally updated at FocusOut!
This change tests _NET_WM_STATE_HIDDEN visibility hint for mapped
window also for FocusIn and FocusOut events, besides the
ConfigureNotify event.
Further more, NormalState to restore a hidden but mapped window did not
work, so it is no more being sent. We limit us here to
_NET_ACTIVE_WINDOW.
2 unit tests are prepared to test this issue:
 - TestGLWindows00NEWT
 - TestParenting01NEWT

Bug 1249: Revert TestParenting01NEWT durationPerTest back to 600
(otherwise breaks test)

Bug 1249 - NEWT X11: setVisible(false)
IconicState/_NET_WM_STATE_HIDDEN: Handle case where KDE unmaps the
window
Update our internal JavaWindow.isMapped according to MapNotify and
UnmapNotify. This takes care of a situation (KDE) where a window is
unmapped during IconicState.
For unmapped windows we cannot interprete _NET_WM_STATE_HIDDEN and we
have to issue XMapWindow for restoring the window.