fix a bug causing wrapped float/flex elements to flicker when sorted

Sortable.js

@@ -683,9 +683,12 @@
 
 							if (elTop === tgTop) {
 								after = (target.previousElementSibling === dragEl) && !isWide || halfway && isWide;
-							} else {
-								after = tgTop > elTop;
-							}
+							} 
+							else if (target.previousElementSibling === dragEl || dragEl.previousElementSibling === target) {
+                                after = (evt.clientY - targetRect.top) / height > 0.5;
+                            } else {
+                                after = tgTop > elTop;
+                            }
 						} else {
 							after = (nextSibling !== dragEl) && !isLong || halfway && isLong;
 						}

index.html

@@ -49,7 +49,7 @@
 			<ul id="bar" class="block__list block__list_tags">
 				<li>казнить</li>
 				<li>,</li>
-				<li>нельзя</li>
+				<li style="height: 100px; width: 280px;">нельзя</li>
 				<li>помиловать</li>
 			</ul>
 		</div>