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Fixes item width calculation when `box-sizing`='border-box'. Fixes Issue #633 #786

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When items use box-sizing:border-box, a wrong slider.boxPadding is calculated, resulting in a smaller width per item.
This change checks if items has this border-box value and sets 0 to slider.boxPadding. Different css prefixes are taken into account.


Confirmed this fix works for border box items like zen grids based layouts, etc. Thank you.


@clinisbut Line 700 needs to end in a comma, not a semi-colon. That way the new boxSizing variable will be included in the var list and, thus, will not be a global variable like it is in 9de3a01.


Please, don't merge this yet as I've found there's still issues when border-box is used.
I think calls to $.width() to set width to item elements should be replaced with $.css('width') as stated in jQuery docs:

Note that .width() will always return the content width, regardless of the value of the CSS box-sizing property.

As of jQuery 1.8, this may require retrieving the CSS width plus box-sizing property and then subtracting any potential border and padding on each element when the element has box-sizing: border-box. To avoid this penalty, use .css("width") rather than .width().

As I don't know what's the target of flexslider I don't know if it is safe to just replace width(x) with css('width',x).

@jeffikus jeffikus closed this Apr 1, 2015
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