Y axis liimts when using multiple variables

[tmelliott]

The ylim seems for each panel is only dependant on the range of the first variable in vars().

I.e., the following code results in an ugly graph ...

frame_calendar(x = time, y = vars(vearly, early, ontime, late, vlate), date = date)

... while this code (I've just put vlate as var 1) looks nice ...

frame_calendar(x = time, y = vars(vlate, vearly, early, ontime, late), date = date)