b.plot(style='corner', parameters=[...]) ignores latex formatting

[kecnry]

Script to reproduce

import phoebe
import numpy as np

b = phoebe.default_binary()
# set parameter values
b.set_value('q', value = 0.6)
b.set_value('incl', component='binary', value = 84.5)
b.set_value('ecc', 0.2)
b.set_value('per0', 63.7)
b.set_value('requiv', component='primary', value=1.)
b.set_value('requiv', component='secondary', value=0.6)
b.set_value('teff', component='secondary', value=5500.)

# add an lc dataset
b.add_dataset('lc', compute_phases=phoebe.linspace(0,1,101))
b.set_value_all('ld_mode', 'manual')
b.set_value_all('ld_mode_bol', 'manual')
b.set_value_all('atm', 'blackbody')

#compute the model
b.run_compute(irrad_method='none')

# extract the arrays from the model that we'll use as observables in the next step
times = b.get_value('times', context='model', dataset='lc01')
# here we're adding noise to the fluxes as well to make the fake data more "realistic"
np.random.seed(0) # to ensure reproducibility with added noise
fluxes = b.get_value('fluxes', context='model', dataset='lc01') + np.random.normal(size=times.shape) * 0.02
sigmas_lc = np.ones_like(times) * 0.04

b = phoebe.default_binary()

b.add_dataset('lc', times=times, fluxes=fluxes, sigmas=sigmas_lc)
b.set_value_all('ld_mode', 'manual')
b.set_value_all('ld_mode_bol', 'manual')
b.set_value_all('atm', 'blackbody')

b.add_distribution({'q': phoebe.gaussian_around(0.2),
                    'incl@binary': phoebe.gaussian_around(7),
                    'teff@primary': phoebe.gaussian_around(12),
                    'teff@secondary': phoebe.gaussian_around(200)},                   
                    distribution='s1')

b.add_solver('sampler.emcee', solver='emcee_solver',overwrite=True)
b.set_value('init_from', ['s1'],overwrite=True)
b.set_value('compute', solver='emcee_solver', value='phoebe01')
b.run_solver('emcee_solver', niters=10, nwalkers=16, solution='emcee_sol',overwrite=True)

b.get_parameter(qualifier='q', component='binary', context='component')._latexfmt = 'q'

b.get_parameter(qualifier='incl', component='binary', context='component')._latexfmt = 'i'
b.get_parameter(qualifier='teff', component='primary', context='component')._latexfmt = 'TT_\mathrm{{1}}'
b.get_parameter(qualifier='teff', component='secondary', context='component')._latexfmt = 'TT_\mathrm{{2}}'

b.save('test.bundle')

import phoebe

b = phoebe.load('test.bundle')

afig, mplfig = b.plot(solution='emcee_sol', style='corner', show=True,
       parameters=['q', 'incl@binary', 'teff@primary', 'teff@secondary'])

See #726