Center zooming around axis origin when nsPerPx gets limited to minNsPerPx #175
Description
When zooming to very small spans (e.g. 1ns ones), the nsPerPx necessary to display only the span would be too small and it gets limited to 0.005 instead. This causes the span to be displayed on the far left of the window, with other spans being visible next to it. It should be centered around the axis origin instead, as that's where the user's focus lies. Or maybe it should always be centered around the window's center instead? After all, that's where span labels are located when zooming to spans that aren't tiny.