Don't clip colorbar dividers

They are sometimes right on the edge of the Axes, and the last (or possibly first) don't get drawn due to clipping. Because the divider line width is the same as the Axes frame line width, we don't have to worry about it going outside when unclipped. Fixes #22864
matplotlib · Aug 4, 2022 · 298a23f · 298a23f
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commit 298a23f
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diff --git a/lib/matplotlib/colorbar.py b/lib/matplotlib/colorbar.py
@@ -434,7 +434,8 @@ def __init__(self, ax, mappable=None, *, cmap=None,
         self.dividers = collections.LineCollection(
             [],
             colors=[mpl.rcParams['axes.edgecolor']],
-            linewidths=[0.5 * mpl.rcParams['axes.linewidth']])
+            linewidths=[0.5 * mpl.rcParams['axes.linewidth']],
+            clip_on=False)
         self.ax.add_collection(self.dividers)
 
         self._locator = None

diff --git a/lib/matplotlib/tests/baseline_images/test_colorbar/extend_drawedges.pdf b/lib/matplotlib/tests/baseline_images/test_colorbar/extend_drawedges.pdf
diff --git a/lib/matplotlib/tests/baseline_images/test_colorbar/extend_drawedges.png b/lib/matplotlib/tests/baseline_images/test_colorbar/extend_drawedges.png
diff --git a/lib/matplotlib/tests/baseline_images/test_colorbar/extend_drawedges.svg b/lib/matplotlib/tests/baseline_images/test_colorbar/extend_drawedges.svg