ngAnimate + ngShow/ngHide ruins elements that do not use display:block

[matsko]

If an element has a display style like display:flex then during the show/hide animation the display rendering of the element will be set to block which may ruin the overall look of the element whilst in animation. We need a fix that ensures that only display:none!important is applied and it is only applied when the .ng-hide class (and none of the animation-related generated classes) is present.