GH-15584: Fix python explain re-rendering [nocheck] (#15586)

* Fix python explain re-rendering

* Do not render images when render=False

h2o-py/h2o/explanation/_explain.py

@@ -46,7 +46,7 @@ def _dont_display(object):
     """
     import matplotlib.figure
     plt = get_matplotlib_pyplot(False, raise_if_not_available=True)
-    if isinstance(object, matplotlib.figure.Figure):
+    if isinstance(object, matplotlib.figure.Figure) or is_decorated_plot_result(object) and (object.figure() is not None):
         plt.close()
     return object
 
@@ -179,7 +179,10 @@ class H2OExplanation(OrderedDict):
     def _ipython_display_(self):
         from IPython.display import display
         for v in self.values():
-            display(v)
+            if is_decorated_plot_result(v):
+                display(v.figure())
+            else:
+                display(v)
 
 
 @contextmanager

h2o-py/h2o/plot/_plot_result.py

@@ -4,10 +4,19 @@
 
 __no_export = set(dir())  # all variables defined above this are not exported
 
+
 class _MObject(object): pass
+
+
 class _MTuple(tuple): pass
+
+
 class _MList(list): pass
+
+
 class _MDict(dict): pass
+
+
 class _MStr(str): pass
 
 
@@ -31,7 +40,7 @@ def get_figure():
         dec = _MDict(res)
     elif isinstance(res, str):
         dec = _MStr(res)
-    else: # should be an H2O instance, should be mutable
+    else:  # should be an H2O instance, should be mutable
         dec = res
     dec.figure = get_figure
     dec._is_decorated_plot_result = True