cubicweb-container #4772977 Fix yams SchemaLoader monkeypatch to properly set yams.reader.context [in-progress]

Fix yams SchemaLoader monkeypatch to properly set yams.reader.context

prioritynormal
typebug
done in2.7.1
load0.200
load left0.200
closed by<not specified>
patchFix yams SchemaLoader monkeypatch to properly set yams.reader.context [rejected]