Bug report

Bug summary

The default colourbar label is shifted such that it doesn't overlap with the first item of the colorbar ticks. But when negative numbers are available below it overlaps them as shown below.

Code for reproduction

cbar = plt.colorbar(im, ax = axes[1, 1])
cbar.ax.set_ylabel('RT(1ax) - RT(2ax) [ms]', rotation=270)

Actual outcome

Expected outcome

Such that label of colourbar is shifted more to the right and it doesn't overlap with negative values from the colorbar axis.

Matplotlib version

• Operating system: MacOS

• Matplotlib version: 3.2.2

• Matplotlib backend (print(matplotlib.get_backend())): MacOSX

• Python version: 3.7.7

• Other libraries: installed from conda