MRG, VIZ, BUG: handle CSD channel type when topo plotting #7935
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closes #7933
The approach in 1b9ff53 works, in that it yields a correct topo layout for the CSD-transformed EEG data. However, it breaks 3 tests in
mne/viz/tests/test_topo.pyso it's probably not an approach worth keeping. Other possible approaches:has_eeg_csd_coils?) tomne.channels.channels._get_ch_inforather than hacking it to returnTrueforhas_eeg_coilswhen only CSD channels are present.mne.channels.layout.make_eeg_layout, use a booleanallow_csdparameter instead of ach_types=['eeg', 'csd']parameter; and makeeeg=Truealways the case in the call topick_typestherein.I'm not very familiar with this part of the codebase, so any suggestions are welcome.