DXF writer: do not set 0 as the value for DXF code 5 (HANDLE)

[rouault]

as it is apparently a reserved value.

Fixes #11299

[atlight]

Fixes #11303

That would be #11299 .

Honestly the code at

gdal/ogr/ogrsf_frmts/dxf/ogrdxfwriterlayer.cpp

Line 173 in 1b32bc8

poDS->WriteEntityID(fp, nGotFID, poFeature->GetFID());

just looks wrong. There is no such thing as an "entity ID"; DXF entities have an "entity handle". The value of the EntityHandle field, if set, should be used as the entity handle, otherwise we should just be making one up. Using the FID for the entity handle is nonsense and should never have been done.

[rouault]

That would be #11299 .

corrected, thanks

The value of the EntityHandle field, if set, should be used as the entity handle, otherwise we should just be making one up. Using the FID for the entity handle is nonsense and should never have been done.

yes, I agree that looks dubious. But perhaps as a temporary measure (especially for the sake of a 3.10 backport), we can live with that in the mean time ? I can create an issue to remember we should do something along the line you mention.

[atlight]

But perhaps as a temporary measure (especially for the sake of a 3.10 backport), we can live with that in the mean time ? I can create an issue to remember we should do something along the line you mention.

Yes, if this fixes the user's immediate issue I am not opposed to it going in, but it is certainly something that needs addressing properly down the track.

Incidentally, it would help me if you could briefly explain why ogr2ogr doesn't appear to hit this code path? It seems to always write an entity handle of 20000 no matter what id value I set in the user's GeoJSON minimal example.

[rouault]

if you could briefly explain why ogr2ogr doesn't appear to hit this code path?

ogr2ogr by default doesn't set the FID of the new feature from the FID of the source feature, when the target driver has no layer FID creation option. It lets its to OGRUnsetFID == -1.
Whereas GDALDataset::CopyLayer() always set the FID of the new feature from the source one.

[coveralls]

coverage: 73.702% (-0.002%) from 73.704%
when pulling 5ecc163 on rouault:fix_11299
into a00fbc1 on OSGeo:master.