Partially revert the _manipulateGraphicsForWindowMoveResize changes

When reshaping windows, the extents may not be the same.
Don't use manipulateGraphicsForWindowMoveResize for reshaping

There's really no point, given that the x/y positions aren't changing.
Extract rounded rectangle region generation

This will be add some form of frame buttons in the future.
Don't use the DOM for calculating winX/winY

We eventually want to move over to an input shape model without
DOM input windows.
Remove the DOM input window stuff

Move to a region-based model where we calculate everything ourselves.
Minor