For normal and stacked graphs, it seems there can sometimes be wasted space to the left-hand side of the graph - between the image border and the Y-axis.

My guess would be the space is intentionally set aside for larger values on the Y-axis - but it would still be nice if the graph were able to grow to fill this space where safe to do so. In the attached screenshot, 'ExampleGraph.png', a stacked graph where the minimum and maximum values of the Y-axis are fixed still shows quite a lot of unused space.

When viewing a single graph this is not much of an issue but on a screen displaying many graphs, with several in each row, wasted space becomes more of a problem.