Comment 1 for bug 1020508

Same complaint as Bug #775839 “layer info gets lost with object group”

Quoting my comment from there:
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As much as objects can't belong to several groups at the same time, it is technically not possibly for objects within one group to belong to different layers (layers in Inkscape are implemented as groups) - see also comment #3 in bug #171627.

Related reports:
Bug #171627 in Inkscape: “objects in groups should remember their layer”
Bug #622589 in Inkscape: “Place warning before grouping objects of different layers”

Proposing to link as duplicate to bug #622589.
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