John Baldwin c3db6aa680 Explicitly return None for negative event indices. Prior to this, ... eventat(-1) would return the next-to-last event causing the back button to cycle back to the end of an event source instead of stopping at the start.		2014-09-30 17:19:07 +00:00
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schedgraph.py	Explicitly return None for negative event indices. Prior to this,	2014-09-30 17:19:07 +00:00