REF: avoid inferred_type checks in plotting (#62160)

Author: jbrockmendel

doc/redirects.csv

@@ -643,7 +643,6 @@ generated/pandas.Index.get_slice_bound,../reference/api/pandas.Index.get_slice_b
 generated/pandas.Index.groupby,../reference/api/pandas.Index.groupby
 generated/pandas.Index.has_duplicates,../reference/api/pandas.Index.has_duplicates
 generated/pandas.Index.hasnans,../reference/api/pandas.Index.hasnans
-generated/pandas.Index.holds_integer,../reference/api/pandas.Index.holds_integer
 generated/pandas.Index,../reference/api/pandas.Index
 generated/pandas.Index.identical,../reference/api/pandas.Index.identical
 generated/pandas.Index.inferred_type,../reference/api/pandas.Index.inferred_type

pandas/plotting/_core.py

@@ -46,7 +46,7 @@
 
 
 def holds_integer(column: Index) -> bool:
-    return column.inferred_type in {"integer", "mixed-integer"}
+    return column.dtype.kind in "iu"
 
 
 def hist_series(

pandas/plotting/_matplotlib/core.py

@@ -101,7 +101,7 @@
 
 
 def holds_integer(column: Index) -> bool:
-    return column.inferred_type in {"integer", "mixed-integer"}
+    return column.dtype.kind in "iu"
 
 
 def _color_in_style(style: str) -> bool: