Invalidate max, min, & hist before updateOverlay & redraw #1293
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Partially addresses #1282.
When zooming, max/min hold data are often incorrect, combining the previous & current zoom levels. This happens because the span and center frequency are changed, and then
updateOverlay(anddraw) are called, but max/min hold data are still marked as valid. Moving the invalidations before theupdateOverlaycall (as is the case elsewhere) solves the problem.