Fix: Log Colorbar minorticks_off reverted if ticks set - #13351

PR Summary

Closes #13339.

Fixes issue where colorbar lognorm minorticks are turned back on anytime ticks are updated.

Before

Any time ColorbarBase.update_ticks is called, it forces minorticks on for LogNorm. Calling methods like set_ticks therefore reverts the action of minorticks_off.

fig, ax = plt.subplots()

data = np.clip(randn(250, 250)*1000, 0, 1000)

cax = ax.imshow(data, norm=mpl.colors.LogNorm(vmin=1, vmax=1000))
cbar = fig.colorbar(cax, format='%d')

cbar.minorticks_off()
cbar.set_ticks([5, 10, 100])

plt.show()

Produces,

(Note minorticks come back on, after being explicitly turned off.)

After

Minorticks stay off after being manually turned off.

PR Checklist

• Has Pytest style unit tests
• Code is Flake 8 compliant
• New features are documented, with examples if plot related
• Documentation is sphinx and numpydoc compliant
• Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
• Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way