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* fix(io): a viewport looks at its view target plus its centre (#2492) A DXF stores a view's centre in display coordinates, whose origin is the view target (DXF Reference: VIEWPORT 12/22 and 17/27/37, VPORT 12/22 and 17/27/37, VIEW 10/20 and 12/22/32). The readers took the centre alone, so a file that keeps the location in the target with a centre of 0,0 (as ArchiCAD's AutoCAD 2018 export does) showed model point 0,0 in every layout viewport, on screen and when plotted. The VIEWPORT entity, VPORT tiles and named views now read the target plus the centre. A sum that overflows keeps the stored centre. The writers already store the whole location as the centre with a target of 0, so a save and reopen keeps the view, through DXF and DWG. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * test(io): a viewport looking along another direction centres on its target Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: austin62jake <340374338+austin62jake@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>