Fixes: NB#206058 - Sometimes MSceneWindow uses the landscape style even when the MWindow has been locked to portrait
Fixes: NB#206058 - Sometimes MSceneWindow uses the landscape style even when the MWindow has been locked to portrait

RevBy: TrustMe
Details: Documentation update for MWindow. MSceneManager has to
recalculate orientation angle (re-request it from MOrientationTracker)
in its constructor in order to rotate the scene root element correctly
for standard MApplicationWindow-based applications.
Any MWindow-based application that is going to use MSceneManager should
set a scene manager for window before performing any orientation angle
operations.

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