Handle dragging VP widgets out of the MDI area
The way visualization pipelines are displayed has been considerably reworked. A new class, VisualizationPipelineWrapper, is now responsible for creating all necessary representations (VisualizationPipelineWidget, PipelineMdiSubwindow) of a visualization pipeline and seamlessly switching between them in response to the user's actions (window dragging, key presses, etc). As a result, it's now possible to drag visualization pipeline widgets out of the MDI area and turn them into top-level floating windows.
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