Recalc buffers after changed input

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<edited as irrelevant - seemed to be a glitch with Build 600. Moving to Build 610 resolved>

[Ian Venner]

When a user changes an input parameter, prev_calculated == 0 so if the indicator uses a regular main loop it will recalculate and redraw the indicator.

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Kind of explains why I'd never had the problem before - I moved from Build 600 to Build 610 and magically all was well again.

Thanks!