PR summary

If AutoLocator is used, changing the location of axes may change the ticklabels.
Thus the result of tight_layout may not be optimal.

    fig = plt.figure(layout="tight", figsize=(3, 3))
    fig.subplots(3, 3)
    fig.set_facecolor("0.8")

The PR simply runs the algorithm twice.

• ConstrainedLayoutEngine also runs its algorithm twice (_constrained_layout.do_constrained_layout)
• There are failing tests, because the result of running the algorithm twice can be different for running it only once. We need to update the baseline images if this PR to be accepted.
• I can add a simple test if requested.
• My intention is to have this PR merged before I further work on tight_layout support for subfigure #26108.

PR checklist

• new and changed code is tested