Preventing LoadToolWindowLayoutFromFile create new toolwin..

Hi Erik,

Unfortunately no because those tool windows are part of the layout you saved and they might have caused a number of tool window containers to be created that wouldn't have been otherwise. If we didn't create those tool windows then there would potentially be a lot of extra or empty tool window containers and parent dock containers and that would probably mess things up both visually and internally.

You can probably keep a list of tool windows you didn't initialize and then after the layout load, close them.

I'll write down to look into this more to see if there's some way we can allow them to be cancelled upon load and then run through the hierarchy and remove any windows that weren't initialized before the layouts occur.