Fix MarkerStyle for matplotlib compatibility (backport #1113) (#1145)

This is an automatic backport of pull request #1113 done by [Mergify](https://mergify.com). Co-authored-by: Ramon Buckland <rbuckland@users.noreply.github.com>
qiskit-community · Apr 17, 2023 · 38f26aa · 38f26aa
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diff --git a/qiskit_experiments/curve_analysis/visualization/mpl_drawer.py b/qiskit_experiments/curve_analysis/visualization/mpl_drawer.py
@@ -36,7 +36,7 @@
 class MplCurveDrawer(BaseCurveDrawer):
     """Curve drawer for MatplotLib backend."""
 
-    DefaultMarkers = MarkerStyle().filled_markers
+    DefaultMarkers = MarkerStyle.filled_markers
     DefaultColors = tab10.colors
 
     class PrefixFormatter(Formatter):

diff --git a/releasenotes/notes/matplotlib-fix-58d938b49771cf17.yaml b/releasenotes/notes/matplotlib-fix-58d938b49771cf17.yaml
@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    Fixed a deprecated Matplotlib ``MarkerStyle`` usage in the visualization module that was causing warnings in Matplotlib 3.6+.