match_submerged_margins(layoutgrids, fig)
This allows axes that span two columns (or rows) that are offset from one another to have the same size.
This gives the proper layout for something like fig = plt.figure(constrained_layout=True)
axs = fig.subplot_mosaic("AAAB
CCDD")
Without this routine, the axes D will be wider than C, because the margin width between the two columns in C has no width by default, whereas the margins between the two columns of D are set by the width of the margin between A and B. However, obviously the user would like C and D to be the same size, so we need to add constraints to these "submerged" margins.
This routine makes all the interior margins the same, and the spacing between the three columns in A and the two column in C are all set to the margins between the two columns of D.
See test_constrained_layout::test_constrained_layout12 for an example.
Make the margins that are submerged inside an Axes the same size.
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