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879768fbf2
V3d_View/Graphic3d_CView pair has been extended to define subview within the other V3d_View instance. The initialization is done in form of V3d_View::SetWindow() taking parent V3d_View instance on input. Subview definition includes dimensions defined as a fraction of a parent view and offset from a corner. This scheme allows splitting window into several subviews automatically occupying entire viewport, like splitting window into two vertial subviews (100%x50% + 100%x50%), three horizontal subviews (33%x100% + 30%x100% + 30%x100%), 1 + 2 stacked subviews (50%x100% + 50%x50% + 50%x50%), as well as thumbnail-alike subviews displayed on top of another larger view. OpenGl_View::Redraw() blits content of subviews into the window within immediate redraw step. AIS_ViewController::FlushViewEvents() has been extended to re-calculate mouse input into local subview coordinates. AIS_ViewController::handleViewRedraw() first redraws subviews and then parent views. Introduced new callback AIS_ViewController::OnSubviewChanged() to switch input focus to another subview on mouse click, implemented by ViewerTest_EventManager (has to be done at application level). vinit command has been extended with parameters -subview and -parent to create a subview. In addition, view dimension arguments now can be defined as a fraction of screen size instead of pixels.