[Python] Why can't subfigures be nested in gridspecs to keep their suptitles separate in...

I would expect this code:

import matplotlib.pyplot as plt

fig = plt.figure(figsize=(8, 6))

fig_gridspec = fig.add_gridspec(1, 1)

top_subfig = fig.add_subfigure(fig_gridspec[(0, 0)])

top_subfig.suptitle("I am the top subfig")

top_subfig_gridspec = top_subfig.add_gridspec(1, 1, top=.7)

nested_subfig = top_subfig.add_subfigure(top_subfig_gridspec[(0, 0)])

nested_subfig.suptitle("I am the nested subfig")

plt.show()


to generate two suptitles on different lines. Instead, they are overlapping.



Can anyone explain why? Also, is there a way to achieve such separation with nested subfigures?

Edit: To be clear, I mean, without changing the dimensions of the grid in the gridspec.

I know I can do this, and it might be what I wind up doing:

import matplotlib.pyplot as plt

fig = plt.figure(figsize=(8, 6))

fig_gridspec = fig.add_gridspec(1, 1)

top_subfig = fig.add_subfigure(fig_gridspec[(0, 0)])

top_subfig.suptitle("I am the top subfig")

top_subfig_gridspec = top_subfig.add_gridspec(2, 1, height_ratios=[.1, 1])

nested_subfig = top_subfig.add_subfigure(top_subfig_gridspec[(1, 0)])

nested_subfig.suptitle("I am the nested subfig")

plt.show()


I just don't understand why my first code block doesn't work, and why there seems to be no way to adjust a nested subfigures's position within another subfigure.

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