qutip / qutip-qip / 29709670615

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Fix plot_pulses colors on matplotlib 3.11 (#415)

matplotlib 3.11 changed the default axes.prop_cycle to yield RGB tuples
instead of hex strings. plot_pulses passed the cycle color as the third
positional argument of ax.fill/ax.plot. That slot is only treated as a
format string when it is a string, so the tuple was instead consumed as
the x data of a further line: the pulse was drawn with no color at all
(falling back to the first entry of the cycle, blue) and the requested
color was rendered as a spurious three-point line of its own R, G and B
values. On all-zero pulse rows, where plot_pulses skips set_ylim, that
stray line autoscaled the axis and showed up as a visible spike.

Pass the color as a keyword argument, which accepts both spellings and
so works on all supported matplotlib versions.

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