Duplicate call to _layout() in relayout function

[jespirit]

Issues

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https://github.com/seiyria/bootstrap-slider/blob/9b9deea6d70ad068fa2aa89f7b6c27c99e09a7d9/src/js/bootstrap-slider.js#L1045-L1049

https://github.com/seiyria/bootstrap-slider/blob/9b9deea6d70ad068fa2aa89f7b6c27c99e09a7d9/src/js/bootstrap-slider.js#L1419-L1424

The function relayout() actually makes two (2) calls to _layout()

relayout()
  -> _resize() -> _layout()
  -> _layout()  // duplicate call