[Deprecated] Get padding for constrained_layout.
Returns a list of w_pad, h_pad in inches and wspace and hspace as fractions of the subplot. All values are None if constrained_layout is not used.
If True, then convert from inches to figure relative.
Deprecated since version 3.6: Use fig.get_layout_engine().get() instead.
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https://matplotlib.org/stable/api/_as_gen/matplotlib.figure.Figure.get_constrained_layout_pads.html