Fix for #182: Last is always null #1
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Especially with asynchronous writing to RRD files, plot won't be able to get the latest data. Instead the graph will end some seconds before. Now, the "last" value is actually the last value shown in the graph.
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I've stumbled over this problem when fiddling around with the multi-axes feature.
So.. Here's a fix for Issue facette#182.
Vincent, feel free do dump this PR if you already have a better idea.
The commit message doesn't mention the issue in ziutek/rrd#13, as even if this gets fixed, cached RRD writes will not show up as last entry reliably.
Especially with asynchronous writing to RRD files, plot won't be able to
get the latest data. Instead the graph will end some seconds before. Now,
the "last" value is actually the last value shown in the graph.
But as the code show