A traceback occurred when trying to reload a graph view with no
groupBy in the searchview, because the array of fields to read
given to the read_group RPC didn't contain the default groupBy
field (Error "Fields in 'groupby' must appear in the list of
fields to read"), e.g. in Sales > My Pipeline.
The groupby property was wrongly set in some cases: if a graph/pivot view is defined as a groupby on field F, but there is another groupby key G in the context, it will take F instead of G (at initial load).
Keys 'graph_mode', 'graph_measure' and 'graph_groupbys' can be
specified in the context and must be used by the graph view to
determine the default mode, meadure and groupbys. Before this rev.,
those keys were simply ignored.
Aaron Bohy