MRG+1: better title in plot_compare_evokeds (closes #6165) (#6173)

* better title in plot_compare_evokeds (closes #6165)

* use logger.info instead of warn

* fix stupidity

* simplify

mne/viz/evoked.py

@@ -1875,6 +1875,8 @@ def plot_compare_evokeds(evokeds, picks=None, gfp=False, colors=None,
     _validate_type(vlines, (list, tuple), "vlines", "list or tuple")
 
     picks = [] if picks is None else picks
+    if title is None and picks in _DATA_CH_TYPES_SPLIT:
+        title = _handle_default('titles')[picks]
     picks = _picks_to_idx(info, picks, allow_empty=True)
     if len(picks) == 0:
         logger.info("No picks, plotting the GFP ...")

mne/viz/utils.py

@@ -32,7 +32,8 @@
                        pick_info, _picks_by_type, pick_channels_cov)
 from ..rank import compute_rank
 from ..io.proj import setup_proj
-from ..utils import verbose, set_config, warn, _check_ch_locs, _check_option
+from ..utils import (verbose, set_config, warn, _check_ch_locs, _check_option,
+                     logger)
 
 from ..selection import (read_selection, _SELECTIONS, _EEG_SELECTIONS,
                          _divide_to_regions)
@@ -2557,7 +2558,7 @@ def _set_title_multiple_electrodes(title, combine, ch_names, max_chans=6,
             title = "{} of {} {}".format(
                 combine, len(ch_names), ch_type)
         elif len(ch_names) > max_chans and combine != "gfp":
-            warn("More than {} channels, truncating title ...".format(
+            logger.info("More than {} channels, truncating title ...".format(
                 max_chans))
             title += ", ...\n({} of {} {})".format(
                 combine, len(ch_names), ch_type,)