[issue #654] Selection
Created by: marcus-oscarsson
Hi,
This PR solves issue #654 (closed) and several other issues with the shape selection mechanism.
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Fixed issues that have been introduced when updating fabric, shape highlighting broken and blue borders displayed around objects
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Fixed bugs with context menu logic, displaying for instance the possibility to create helical scans between lines and grids.
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Simplified selection logic
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Helical line is now arrow with base and arrow at the top
Marcus