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======== https://hg.mozilla.org/integration/gaia-central/rev/e4f586d6a2c7 Author: Mike Pennisi <mike@mikepennisi.com> Desc: Bug 905273 - [Messages] Recipients list pull down animation is inefficient r=julienw In order to use the more efficient `transform` attribute for animating the pull-down, the element responsibilities must be altered. The top-level "#messages-to-field" serves as a basis for positioning the "#to-label" and "#messages-contact-pick-button". It is no longer animated, and because of this, it no longer draws the component's background or border. A new element, "#messages-recipients-list-container" has been introduced to take the responsibilities previously fulfilled by the "#messages-to-field". Animation is implemented via the `transform` attribute. In order to prevent unecessarily scrolling in "multiline" mode, the rendering of the recipients has been simplified. The JavaScript `generateHeightRule` function no longer has to reset the height of the widget: all elements are now rendered at full height. The method has been simplified to simply set the "#message-recipients-list" element's `max-height` in order to trigger the rendering of a scroll bar when the number of recipients causes overflow in multi-line mode.