When expanding the data path for the context, use Context.temp_override
to extract context members. Without this, only context-members available
in the preferences were used which misses members which are likely to
be useful.
Iterate over all windows, areas and regions showing unique member as
candidates. The search is limited to WINDOW/PREVIEW region types, the
preferences space type is also excluded. See the doc-string for
rna_path_prop_search_for_context for additional notes on this.
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