improved layout and fixed bugs introduced new ones

shared/_base.ts

@@ -84,6 +84,19 @@ export class BaseElement extends HTMLElement {
         return result;
     }
 
+    visibleChildren(inElement: HTMLElement = this) {
+        var result = [];
+
+        for (let i = 0; i < inElement.children.length; i++) {
+            const child = <HTMLElement>inElement.children[i];
+            if (child.style.display !== "none") {
+                result.push(child);
+            }
+        }
+
+        return result;
+    }
+
     hasChild(element: Element, startsWidth: boolean = false): boolean {
         var ele = this;