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Note: This also works for walls, but each wall can be node edited separately when using Edit Segments. See Editing Walls.
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Editing Segments Push Mode
When Push Mode is off segments are are simply moved as you drag an arrow and re-sizes as needed.
However when Push Mode is on rather than re-sizing, new geometry is created to fill the resultant gaps.
If the object is a standard 2D polyline etc. you can create self crossing geometry.
However, you cannot create self crossing geometry if the object is a region. Attempting to do so will generate the following error: