Jul 8, 2021 · Jun 22, 2021 · Jun 24, 2021
diff --git a/doc/api/next_api_changes/behavior/20054-JMK.rst b/doc/api/next_api_changes/behavior/20054-JMK.rst
 Axes used to make colorbar now wrapped
 ======================================

 The axes used to place a colorbar is now wrapped by a new parent class
 (``ColorbarAxes``) when the colorbar is created::

    cb = fig.colorbar(im, cax=cax)

 This means that ``cb.ax`` is no longer the same object as ``cax``. However,
 we map all the methods from ``cb.ax`` onto ``cax`` so ``cax`` should remain
 functionally the same as ``cb.ax``.

 Colorbar lines no longer clipped
 ================================

diff --git a/lib/matplotlib/_constrained_layout.py b/lib/matplotlib/_constrained_layout.py
    pbcb = trans_fig_to_subfig.transform_bbox(pbcb)
    cbax.set_transform(fig.transSubfigure)
    cbax._set_position(pbcb)
    cbax.set_aspect(aspect, anchor=anchor, adjustable='box')
    cbax.set_anchor(anchor)
    if location in ['bottom', 'top']:
        aspect = 1 / aspect
    cbax.set_box_aspect(aspect)
    cbax.set_aspect('auto')
    return offset


diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
            return
        patch_trf = patch.get_transform()
        updatex, updatey = patch_trf.contains_branch_seperately(self.transData)
        if not (updatex or updatey):
            return
        if self.name != "rectilinear":
            # As in _update_line_limits, but for axvspan.
            if updatex and patch_trf == self.get_yaxis_transform():
Original file line number	Diff line number	Diff line change
		@@ -1,15 +1,3 @@
		Axes used to make colorbar now wrapped
		======================================

		The axes used to place a colorbar is now wrapped by a new parent class
		(``ColorbarAxes``) when the colorbar is created::

		cb = fig.colorbar(im, cax=cax)

		This means that ``cb.ax`` is no longer the same object as ``cax``. However,
		we map all the methods from ``cb.ax`` onto ``cax`` so ``cax`` should remain
		functionally the same as ``cb.ax``.

		Colorbar lines no longer clipped
		================================

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -575,7 +575,11 @@ def _reposition_colorbar(cbax, renderer, *, offset=None):
		pbcb = trans_fig_to_subfig.transform_bbox(pbcb)
		cbax.set_transform(fig.transSubfigure)
		cbax._set_position(pbcb)
		cbax.set_aspect(aspect, anchor=anchor, adjustable='box')
		cbax.set_anchor(anchor)
		if location in ['bottom', 'top']:
		aspect = 1 / aspect
		cbax.set_box_aspect(aspect)
		cbax.set_aspect('auto')
		return offset


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Original file line number	Diff line number	Diff line change
Expand Up		@@ -2380,6 +2380,8 @@ def _update_patch_limits(self, patch):
		return
		patch_trf = patch.get_transform()
		updatex, updatey = patch_trf.contains_branch_seperately(self.transData)
		if not (updatex or updatey):
		return
Copy link MemberAuthor jklymakJun 24, 2021 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others.Learn more. Calling the transform below blows up needlessly because it is called, and then does nothing....
		if self.name != "rectilinear":
		# As in _update_line_limits, but for axvspan.
		if updatex and patch_trf == self.get_yaxis_transform():
Expand Down