Fix rec-ruler time display
The calculation to round the distance to seconds has to be performed using floating point maths, not just the result being cast to double. The time-granularity must not be zero.
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@ -1591,7 +1591,7 @@ RecorderUI::RecRuler::render (Cairo::RefPtr<Cairo::Context> const& cr, cairo_rec
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const int n_labels = floor (width / (_time_width * 1.75));
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const samplecnt_t time_span = _right - _left;
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const samplecnt_t time_granularity = ceil ((double)(time_span / n_labels / _session->sample_rate ())) * _session->sample_rate ();
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const samplecnt_t time_granularity = ceil ((double)time_span / n_labels / _session->sample_rate ()) * _session->sample_rate ();
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const double px_per_sample = width / (double) time_span;
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const samplepos_t lower = (_left / time_granularity) * time_granularity;
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