Use format() for shared subplot slice titles

[cvanelteren]

We should make more use of the slicing feature to format a subset and assume the user aims to share the titles. This is a move in making the format function more intuitive.

Closes #650 #651

[cvanelteren]

Need to fix a small bbox alignment but other than that it works.

[codecov]

Codecov Report

❌ Patch coverage is 87.20000% with 32 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
ultraplot/figure.py	70.29%	17 Missing and 13 partials ⚠️
ultraplot/gridspec.py	93.93%	1 Missing and 1 partial ⚠️

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[gepcel]

The fix messed up the spaces between rows of axes, when using shared titles with subset of axes.

[cvanelteren]

@gepcel do you have an example?

[cvanelteren]

import ultraplot as uplt

# Test whether ignored for bar plots
fig, ax = uplt.subplots(ncols=2, nrows=2)
ax[0, :].format(title="True")
ax[1, :].format(title="True")
uplt.show(block=1

Looks good I think

[cvanelteren]

[gepcel]

fig,ax=pplt.subplots(ncols=4, nrows=2, refwidth=1)
ax[:,:3].format(title="A test title")

[cvanelteren]

Thanks! Funnily enough the code works fine when index to the first row. Will investigate.

[cvanelteren]

Found the issue; it was feeding back into tight layout causing the figure to act as if the text was still there, overinflating the hspace.

[cvanelteren]

Good catch @gepcel