katspaugh / wavesurfer.js / 2565

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Make waveforms exclude x-axis (restore #478) (#1942)

* Outlines don't include x-axis

In my original mod #478 the waveform min and max were initialized with the first sample, so that a min > 0 or a max < 0 were possible (e.g. for highly zoomed-in views).  This got lost somewhere along the way; this change fixes it.

* Add comments explaining min/max; note in CHANGES.md; modify zoom example to demonstrate.

* Untabify.

395 of 633 branches covered (62.4%)

2 of 2 new or added lines in 1 file covered. (100.0%)

1119 of 1388 relevant lines covered (80.62%)

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