Y-axis labels are impossible to align by baseline #1734
Description
As the example below shows, axis labels are not aligned by text baseline by default, which would be typographically correct.
import pylab
fig, ((ax1, ax2), (ax3, ax4)) = pylab.subplots(2, 2, figsize=(4,3.8))
for ax in ax1, ax2, ax3, ax4:
ax.set_xticks([])
ax.set_yticks([])
ax1.set_ylabel("aaaaaaaajaaaaaaa")
ax3.set_ylabel("aaaaaaaaaaaaaaaa")
ax3.set_xlabel("aaaaaaaajaaaaaaa")
ax4.set_xlabel("aaaaaaaaaaaaaaaa")
For the x-axis labels, alignment by baseline is possible to configure (code below), but it seems to be impossible to do for y-axis labels, because set_horizontalalignment("baseline") is not allowed.
ax3.xaxis.get_label().set_verticalalignment("baseline")
ax4.xaxis.get_label().set_verticalalignment("baseline")
ax3.xaxis.labelpad = 15
ax4.xaxis.labelpad = 15