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Unicode and console unit representations sometimes include an extraneous space #14409
Description
Description
As noted in #14407, for units typset in unicode or console format, a space is included in front, unlike for regular units, yet it is sometimes omitted if a unit scale factor is present.
Expected behavior
unit.to_string(format) should never start with a space, independent of format.
How to Reproduce
From https://github.com/astropy/astropy/pull/14407/files#r1108987447 and https://github.com/astropy/astropy/pull/14407/files#r1109066798:
import astropy.units as u
print(f'{(u.m**-1):unicode}')
1
─
m
f"{(u.eV*u.s**2).decompose()}" # space between scale and unit
'1.60218e-19 kg m2'
f"{(u.eV*u.s**2).decompose():unicode}" # no space between scale and unit
'1.6021766×10⁻¹⁹m² kg'
f"{(1*u.eV*u.s**2).decompose()}" # space between value and unit
'1.602176634e-19 kg m2'
f"{(1 * u.eV*u.s**2).decompose():unicode}" # space between value and unit
'1.602176634e-19 m² kg'Versions
Any astropy really.
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