whats new styler (#43111)

Co-authored-by: JHM Darbyshire (iMac) <attack68@users.noreply.github.com>

Author: attack68

doc/source/whatsnew/v1.4.0.rst

@@ -63,6 +63,21 @@ In Pandas 2.0, :class:`NumericIndex` will become the default numeric index type
 
 See :ref:`here <advanced.numericindex>` for more.
 
+.. _whatsnew_140.enhancements.styler:
+
+Styler
+^^^^^^
+
+:class:`.Styler` has been further developed in 1.4.0. The following enhancements have been made:
+
+  - Styling of indexing has been added, with :meth:`.Styler.apply_index` and :meth:`.Styler.applymap_index`. These mirror the signature of the methods already used to style data values, and work with both HTML and LaTeX format (:issue:`41893`).
+  - :meth:`.Styler.bar` introduces additional arguments to control alignment and display (:issue:`26070`, :issue:`36419`), and it also validates the input arguments ``width`` and ``height`` (:issue:`42511`).
+  - :meth:`.Styler.to_latex` introduces keyword argument ``environment``, which also allows a specific "longtable" entry through a separate jinja2 template (:issue:`41866`).
+  - :meth:`.Styler.to_html` introduces keyword arguments ``sparse_index`` and ``sparse_columns`` (:issue:`41946`)
+  - Keyword argument ``level`` is added to :meth:`.Styler.hide_index` and :meth:`.Styler.hide_columns` for optionally controlling hidden levels in a MultiIndex (:issue:`25475`)
+
+There are also bug fixes and deprecations listed below.
+
 .. _whatsnew_140.enhancements.enhancement2:
 
 enhancement2
@@ -75,13 +90,7 @@ Other enhancements
 - :class:`DataFrameGroupBy` operations with ``as_index=False`` now correctly retain ``ExtensionDtype`` dtypes for columns being grouped on (:issue:`41373`)
 - Add support for assigning values to ``by`` argument in :meth:`DataFrame.plot.hist` and :meth:`DataFrame.plot.box` (:issue:`15079`)
 - :meth:`Series.sample`, :meth:`DataFrame.sample`, and :meth:`.GroupBy.sample` now accept a ``np.random.Generator`` as input to ``random_state``. A generator will be more performant, especially with ``replace=False`` (:issue:`38100`)
--  Additional options added to :meth:`.Styler.bar` to control alignment and display, with keyword only arguments (:issue:`26070`, :issue:`36419`)
-- :meth:`Styler.bar` now validates the input argument ``width`` and ``height`` (:issue:`42511`)
-- Add keyword ``level`` to :meth:`.Styler.hide_index` and :meth:`.Styler.hide_columns` for optionally controlling hidden levels in a MultiIndex (:issue:`25475`)
 - :meth:`Series.ewm`, :meth:`DataFrame.ewm`, now support a ``method`` argument with a ``'table'`` option that performs the windowing operation over an entire :class:`DataFrame`. See :ref:`Window Overview <window.overview>` for performance and functional benefits (:issue:`42273`)
-- Added ``sparse_index`` and ``sparse_columns`` keyword arguments to :meth:`.Styler.to_html` (:issue:`41946`)
-- Added keyword argument ``environment`` to :meth:`.Styler.to_latex` also allowing a specific "longtable" entry with a separate jinja2 template (:issue:`41866`)
-- :meth:`.Styler.apply_index` and :meth:`.Styler.applymap_index` added to allow conditional styling of index and column header values for HTML and LaTeX (:issue:`41893`)
 - :meth:`.GroupBy.cummin` and :meth:`.GroupBy.cummax` now support the argument ``skipna`` (:issue:`34047`)
 -
 
@@ -239,7 +248,6 @@ Categorical
 - Bug in :meth:`Series.where` with ``CategoricalDtype`` when passing a dtype-incompatible value raising ``ValueError`` instead of ``TypeError`` (:issue:`41919`)
 - Bug in :meth:`Categorical.fillna` when passing a dtype-incompatible value raising ``ValueError`` instead of ``TypeError`` (:issue:`41919`)
 - Bug in :meth:`Categorical.fillna` with a tuple-like category raising ``ValueError`` instead of ``TypeError`` when filling with a non-category tuple (:issue:`41919`)
-- Bug in :meth:`.Styler.copy` where ``uuid`` was not previously copied (:issue:`40675`)
 -
 
 Datetimelike
@@ -356,6 +364,7 @@ Styler
 ^^^^^^
 - Minor bug in :class:`.Styler` where the ``uuid`` at initialization maintained a floating underscore (:issue:`43037`)
 - Bug in :meth:`.Styler.to_html` where the ``Styler`` object was updated if the ``to_html`` method was called with some args (:issue:`43034`)
+- Bug in :meth:`.Styler.copy` where ``uuid`` was not previously copied (:issue:`40675`)
 
 Other
 ^^^^^