[Bug]: inset_axes colorbar + tight_layout raises AttributeError

[janosh]

Bug summary

I think #21749 wasn't fully fixed. mpl_toolkits.axes_grid1.inset_locator.inset_axes still appears to be affected. This still throws in v3.5.1:

Code for reproduction

import matplotlib
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1.inset_locator import inset_axes


matplotlib.__version__
# > '3.5.1'

fig, ax = plt.subplots(1, 1)
pts = ax.scatter([0, 1], [0, 1], c=[1, 5])

cax = inset_axes(ax, width="3%", height="70%")
plt.colorbar(pts, cax=cax)

plt.tight_layout()

Actual outcome

AttributeError: 'AnchoredSizeLocator' object has no attribute 'get_subplotspec'

Expected outcome

No error

Additional information

No response

Operating system

No response

Matplotlib Version

3.5.1

Matplotlib Backend

module://matplotlib_inline.backend_inline

Python version

3.10.2

Jupyter version

No response

Installation

pip

[QuLogic]

This bug is specific to the toolkit inset Axes. Using a standard inset Axes does work:

import matplotlib.pyplot as plt


fig, ax = plt.subplots(1, 1)
pts = ax.scatter([0, 1], [0, 1], c=[1, 5])
  
cax = ax.inset_axes([0.9, 0.15, 0.03, 0.7])
plt.colorbar(pts, cax=cax)
  
plt.tight_layout()
  
plt.show()

[jklymak]

Agreed but there is something wrong in the logic detecting if the axes is a subplot spec or not.

Sorry for my temporary absence but I am away from strong enough internet to interact heavily with GitHub.