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Issue created by Administrator@rootContributor

Add support for modals with forced scrollbars (`overflow-y: scroll`)

Created by: pavelhoral

Scrollbar showing/hiding and the related "layout jumping" is usually percieved pretty negatively by users. This is less issue on static web pages, however with dynamic pages or single-page web applications (e.g. AngularJS based) it becames very uncomfortable and distracting.

To workaround this a standard solution is to force browsers to always show vertical scrollbar by setting overflow-y: scroll on <body> element. However this is incompatible with Bootstrap's modal dialog as it checks for scrollbar presence only by checking that the content height is bigger than the viewport.

I would like Bootstrap to support forced scrollbars (i.e. change the detection when the scrollbars are shown).

JS-Bin to demonstrate the current state of things: http://jsbin.com/johobubafa/1/