#3430 Fixes issue with page scroll flickering due to bug in sticky when container height is defined by static sticky height

src/definitions/modules/sticky.js

@@ -286,7 +286,8 @@ $.fn.sticky = function(parameters) {
               context.offset.left += scrollContext.left;
             }
             module.cache = {
-              fits : ( element.height < scrollContext.height ),
+              fits          : (element.height <= scrollContext.height),
+              sameHeight    : (element.height == context.height),
               scrollContext : {
                 height : scrollContext.height
               },
@@ -467,6 +468,7 @@ $.fn.sticky = function(parameters) {
             cachedPosition = scroll || $scroll.scrollTop(),
             cache          = module.cache,
             fits           = cache.fits,
+            sameHeight     = cache.sameHeight,
             element        = cache.element,
             scrollContext  = cache.scrollContext,
             context        = cache.context,
@@ -486,8 +488,7 @@ $.fn.sticky = function(parameters) {
             doesntFit      = !fits,
             elementVisible = (element.height !== 0)
           ;
-
-          if(elementVisible) {
+          if(elementVisible && !sameHeight) {
 
             if( module.is.initialPosition() ) {
               if(scroll.top >= context.bottom) {