If you have a floating pane and dock another pane to it so they are either side by side or top to bottom. When you close the left(or top) pane the remaining pane resizes correctly which is great. But if you take another pane and drag it over this floating pane, it is possible to dock it to a "ghost" of where the previous left(top) pane was. Using the Smart docking mode, you get the rectangles for docking that you would expect if that pane was never closed, while also having the options to dock to the entire window like it should behave.
Visual Studio/Silverlight/Tooling version
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