Moved whatsnew documentation from v2.3.0 to v3.0.0 as requested, added issue tracking number to test as requested

Author: tev-dixon

doc/source/whatsnew/v2.3.0.rst

@@ -143,7 +143,7 @@ Period
 
 Plotting
 ^^^^^^^^
-- Bug in :meth:`DataFrame.plot.bar` with ``stacked=True`` where labels on stacked bars with zero-height segments were incorrectly positioned at the base instead of the label position of the previous segment (:issue:`59429`)
+-
 -
 
 Groupby/resample/rolling

doc/source/whatsnew/v3.0.0.rst

@@ -710,6 +710,7 @@ Period
 Plotting
 ^^^^^^^^
 - Bug in :meth:`.DataFrameGroupBy.boxplot` failed when there were multiple groupings (:issue:`14701`)
+- Bug in :meth:`DataFrame.plot.bar` with ``stacked=True`` where labels on stacked bars with zero-height segments were incorrectly positioned at the base instead of the label position of the previous segment (:issue:`59429`)
 - Bug in :meth:`DataFrame.plot.line` raising ``ValueError`` when set both color and a ``dict`` style (:issue:`59461`)
 - Bug in :meth:`DataFrame.plot` that causes a shift to the right when the frequency multiplier is greater than one. (:issue:`57587`)
 - Bug in :meth:`Series.plot` with ``kind="pie"`` with :class:`ArrowDtype` (:issue:`59192`)

pandas/tests/plotting/frame/test_frame.py

@@ -775,6 +775,7 @@ def test_bar_nan_stacked(self):
         assert result == expected
 
     def test_bar_stacked_label_position_with_zero_height(self):
+        # GH 59429
         df = DataFrame({"A": [3, 0, 1], "B": [0, 2, 4], "C": [5, 0, 2]})
         ax = df.plot.bar(stacked=True)
         ax.bar_label(ax.containers[-1])