[PATCH] Avoid plotting when ProfileWidget2::plotDive is called speciously.

[Robert C. Helling]

Hi,

> On 23 Oct 2015, at 07:24, K. pestophagous Heller <pestophagous at gmail.com> wrote:
> 
> One indirect call site of plotDive, MainTab::acceptChanges, can
> trigger a replot several times during one pass through
> acceptChanges.  Avoiding some of the replots is both an
> optimization and a small bug-fix.  A replot could happen when
> displayed_dive is presently zeroed-out, which made no sense.

this is a good idea but it is too blunt: With this, when you open the planner on an empty log (I do this quite often when I don’t want any previous dives influence my calculation), you don’t get any plot at all.

So: NAK

Best
Robert
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