Problem

According tohttps://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.indicate_inset.html#matplotlib.axes.Axes.indicate_inset
edgecolor,facecolor,alpha andzorder are set on both the rectangle can connector lines. However, it can be quite convenient to be able to set other line properties, such aslinestyle andlinewidth directly as well, which are now passed to the rectangle only.

Proposed solution

As it is not a good idea to change the behavior, I suggest that aconnector_kw argument is added so that those can be passed directly.