BUG: Not all viewers have get_limits (#3361)

Add test and change log.

Test was proven to fail on main locally.

CHANGES.rst

@@ -70,6 +70,8 @@ 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 +137,15 @@ 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 some tools work
+
+    po_panzoom = po.stretch_histogram.toolbar.tools["jdaviz:panzoom"]
+    po_panzoom.activate()
+    po_panzoom.deactivate()
+
+    po_prevzoom = po.stretch_histogram.toolbar.tools["jdaviz:prevzoom"]
+    po_prevzoom.activate()
+
 
 @pytest.mark.filterwarnings('ignore')
 def test_user_api(cubeviz_helper, spectrum1d_cube):

jdaviz/core/tools.py

@@ -40,7 +40,10 @@ class _BaseZoomHistory:
     # Mixin for custom zoom tools to be able to save their previous zoom state
     # which is then used by the PrevZoom tool
     def save_prev_zoom(self):
-        self.viewer._prev_limits = self.viewer.get_limits()
+        # Cannot use viewer.get_limits() here because viewers from
+        # glue-jupyter does not have that method.
+        self.viewer._prev_limits = (self.viewer.state.x_min, self.viewer.state.x_max,
+                                    self.viewer.state.y_min, self.viewer.state.y_max)
 
 
 class _MatchedZoomMixin: