Add test and change log.

Test was proven to fail on main locally.

CHANGES.rst

@@ -68,6 +68,8 @@ Bug Fixes
   occured when certain flux-to flux-conversions occured, as well as certain conversions between flux and surface
   brightness. This PR also fixed an issue with unit string formatting in the aperture photometry plugin. [#3228]
 
+-  Fixed broken histogram pan/zoom in Plot Options plugin. [#3361]
+
 Cubeviz
 ^^^^^^^
 - Removed the deprecated ``save as fits`` option from the Collapse, Moment Maps, and Spectral Extraction plugins; use the Export plugin instead. [#3256]

jdaviz/configs/default/plugins/plot_options/tests/test_plot_options.py

@@ -137,6 +137,11 @@ def test_stretch_histogram(cubeviz_helper, spectrum1d_cube_with_uncerts):
     assert po.stretch_histogram.marks['vmin'].x[0] == po.stretch_vmin.value
     assert po.stretch_histogram.marks['vmax'].x[0] == po.stretch_vmax.value
 
+    # Make sure panzoom works
+    po_panzoom = po.stretch_histogram.toolbar.tools["jdaviz:panzoom"]
+    po_panzoom.activate()
+    po_panzoom.deactivate()
+
 
 @pytest.mark.filterwarnings('ignore')
 def test_user_api(cubeviz_helper, spectrum1d_cube):