[Qt-interest] hide one of QMainWindow separators

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Hi all,

There is QMainWindow with several QDockWidgets
Dock widget at top area of mainwindow can not be resized - has fixed height.
But there is a separator between this top dock widget and central 
widget. it can not be dragged, because top widget has fixed height.
Can i somehow hide this separator (only this one, other separators are 
needed)?

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