bug: no graph drawn on left side for small dataPointSpacing

[patLoeber]

For small dataPointSpacing, the graph is not drawn on the left side. It only draws when scrolled to the left, which then produces an ugly jumping.

This is reproduced in your example project with:
numberOfDataItems = 60 and in createDarkGraph:
linePlot.shouldFill = false
graphView.dataPointSpacing = 10

If the fill is set to true, the graph is drawn, but also creates an ugly jumping behaviour while scrolling to the left.

If leftmostPadding is set to 0, this does not happen, so it has probably something to do with padding calculations.