05af72fc2e
In 3fcf535d2e, the `ID.flag` data was split, keeping persisten flags in
`ID.flag`, and moving runtime ones into a new `ID.tag` data.
Some versionning code was then added to cleanup the existing `ID.flag`
on file read, but embedded IDs (root node trees only, back then) are not
stored in Main data-base, and were skipped.
Note that this fixes the conversion of older (2.76.4 and older) files.
There is no reliable way to cleanup files opened and saved from more
recent versions of Blender unfortunately.
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