Cubes with long-named Ancillary-Variables or Cell-Measures won't print out #4123
Description
🐛 Bug Report
Cubes with too-long names of Ancillary Variables or Cell-measures can't be printed
How To Reproduce
Steps to reproduce the behaviour:
>>> cube = Cube(np.zeros((20,20,20)))
>>> cube.add_ancillary_variable(AncillaryVariable(np.zeros(20), long_name='ancil'), 0)
>>> cube.add_cell_measure(CellMeasure(np.zeros(20), long_name='cellm'), 1)
>>> print(cube)
unknown / (unknown) (-- : 20; -- : 20; -- : 20)
Cell measures:
cellm - x -
Ancillary variables:
ancil x - -
>>> cube.cell_measures()[0].rename('rather-overlong-named-cell-measure')
>>> cube
<iris 'Cube' of unknown / (unknown) (-- : 20; -- : 20; -- : 20)>
>>> print(cube)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/h05/itpp/git/iris/iris_main/lib/iris/cube.py", line 2594, in __str__
return self.summary()
File "/home/h05/itpp/git/iris/iris_main/lib/iris/cube.py", line 2470, in summary
cell_measures=vector_cell_measures,
File "/home/h05/itpp/git/iris/iris_main/lib/iris/cube.py", line 2397, in vector_summary
pad=" ", width=width, char=char
ValueError: Sign not allowed in string format specifier
>>> cube.cell_measures()[0].rename('cellm')
>>> cube.ancillary_variables()[0].rename('rather-overlong-named-ancillary-variable')
>>> print(cube)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/h05/itpp/git/iris/iris_main/lib/iris/cube.py", line 2594, in __str__
return self.summary()
File "/home/h05/itpp/git/iris/iris_main/lib/iris/cube.py", line 2483, in summary
ancillary_variables=vector_ancillary_variables,
File "/home/h05/itpp/git/iris/iris_main/lib/iris/cube.py", line 2411, in vector_summary
pad=" ", width=width, char=char
ValueError: Sign not allowed in string format specifier
>>>
Expected behaviour
It should extend the dimensions map to accommodate the longest name, as it would do for long-named coords.
Environment
tested with Iris release v3.0.1
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