Hi Harrissou,
that's a good question. From what I understood the icon/flag is added
"manually" when needed (by QFieldSync, Offline editing plugin, etc).
Not sure how/when it should removed: maybe changing the data source is
still pointing to an offline layer.
At the beginning I was thinking that if a layer was "converted" to
offline and for example put into a geopackage, then some additional
metadata were added in some additional table within the geopackage itself.
But now I understand that the flag is manually added by the developer
Cheers
Matteo
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