Fix ConciseDateFormatter when only micros change

leolchat · web-flow · commit 4876bb561840 · 2020-04-29T20:33:26.000-07:00
When micros only are changing (we are zoomed inside a second),
the formatter previously computed a level 0 : year,
displaying only years... when microseconds were expected.
diff --git a/lib/matplotlib/dates.py b/lib/matplotlib/dates.py
@@ -775,6 +775,10 @@ def format_ticks(self, values):
         for level in range(5, -1, -1):
             if len(np.unique(tickdate[:, level])) > 1:
                 break
+            elif level == 0:
+                # all tickdate are the same, so only micros might be different
+                # set to the most precise available (level=6: microseconds doesn't exist...)
+                level = 5
 
         # level is the basic level we will label at.
         # now loop through and decide the actual ticklabels
