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jklymakjklymak
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Redo colorbar overhaul.
Previous overhaul packaged an inner and outer axes in a container "ColorbarAxes" and tried to dispatch methods between them. This overhaul takes the _much_ simpler approach of resizing the image using a custom _axes_locator that a) calls any existing locator b) or just uses the axes default position. The custom _axes_locator then shrinks the axes in the appropriate direction to make room for extend tri/rectangles. As with the previous fix, the extend tri/rectangles are drawn as patches in axes co-ordinates, rather than pcolormesh in "data" co-ordinates.
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‎doc/api/next_api_changes/behavior/20054-JMK.rst‎

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Axes used to make colorbar now wrapped
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======================================
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The axes used to place a colorbar is now wrapped by a new parent class
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(``ColorbarAxes``) when the colorbar is created::
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cb = fig.colorbar(im, cax=cax)
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This means that ``cb.ax`` is no longer the same object as ``cax``. However,
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we map all the methods from ``cb.ax`` onto ``cax`` so ``cax`` should remain
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functionally the same as ``cb.ax``.
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Colorbar lines no longer clipped
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================================
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‎lib/matplotlib/_constrained_layout.py‎

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@@ -575,7 +575,11 @@ def _reposition_colorbar(cbax, renderer, *, offset=None):
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pbcb = trans_fig_to_subfig.transform_bbox(pbcb)
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cbax.set_transform(fig.transSubfigure)
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cbax._set_position(pbcb)
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cbax.set_aspect(aspect, anchor=anchor, adjustable='box')
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cbax.set_anchor(anchor)
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if location in ['bottom', 'top']:
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aspect = 1 / aspect
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cbax.set_box_aspect(aspect)
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cbax.set_aspect('auto')
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return offset
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‎lib/matplotlib/axes/_base.py‎

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@@ -2380,6 +2380,8 @@ def _update_patch_limits(self, patch):
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return
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patch_trf = patch.get_transform()
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updatex, updatey = patch_trf.contains_branch_seperately(self.transData)
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if not (updatex or updatey):
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return
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if self.name != "rectilinear":
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# As in _update_line_limits, but for axvspan.
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if updatex and patch_trf == self.get_yaxis_transform():

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