remove help button when reaching footer by scroll, update submodules

explore/src/app/app.component.ts

@@ -1,4 +1,4 @@
-import {ChangeDetectorRef, Component, ViewChild} from '@angular/core';
+import {ChangeDetectorRef, Component, ElementRef, ViewChild} from '@angular/core';
 import {ActivatedRoute, Router} from '@angular/router';
 import {EnvProperties} from './openaireLibrary/utils/properties/env-properties';
 import {MenuItem} from './openaireLibrary/sharedComponents/menu';
@@ -51,9 +51,9 @@ import {LayoutService} from './openaireLibrary/dashboard/sharedComponents/sideba
                    ratio="1"><polyline fill="none" stroke="#000" stroke-width="1.03" points="7 4 13 10 7 16"></polyline></svg>
               </span></a>
     </cookie-law>
+    <bottom id="bottom" #bottom *ngIf="isClient && properties" [properties]="properties"></bottom>
 		<quick-contact #quickContact *ngIf="showQuickContact && contactForm" (sendEmitter)="send($event)"
 			[contactForm]="contactForm" [sending]="sending" [contact]="'Help'"></quick-contact>
-    <bottom id="bottom" *ngIf="isClient && properties" [properties]="properties"></bottom>
 		<modal-alert #modal [overflowBody]="false"></modal-alert>
   `
 })
@@ -70,6 +70,7 @@ export class AppComponent {
 	public sending: boolean = false;
 	@ViewChild('quickContact') quickContact: QuickContactComponent;
 	@ViewChild('modal') modal: AlertModal;
+	@ViewChild('bottom', {read: ElementRef}) bottom: ElementRef;
 
   subscriptions = [];
   
@@ -126,6 +127,33 @@ export class AppComponent {
     this.userManagementService.clearSubscriptions();
     this.smoothScroll.clearSubscriptions();
   }
+
+	ngAfterViewInit() {
+		if (typeof window !== "undefined") {
+      this.createObservers();
+    }
+	}
+
+	createObservers() {
+		let options = {
+			root: null,
+			rootMargin: '300px',
+			threshold: 1.0
+		};
+		let intersectionObserver = new IntersectionObserver(entries => {
+			entries.forEach(entry => {
+        if (entry.isIntersecting && this.showQuickContact) {
+          this.showQuickContact = false;
+          this.quickContactService.setDisplay(this.showQuickContact);
+        } else if (!entry.isIntersecting && !this.showQuickContact) {
+          this.showQuickContact = true;
+          this.quickContactService.setDisplay(this.showQuickContact);
+        }
+      });
+		}, options);
+		intersectionObserver.observe(this.bottom.nativeElement);
+		this.subscriptions.push(intersectionObserver);
+	}
   
   buildMenu() {
 		this.userMenuItems = [];

explore/src/app/openaireLibrary

@@ -1 +1 @@
-Subproject commit f53ca8fde82ab31581b2248550e71272d589c905
+Subproject commit c862be75613fa1cf08a3bf276b9f4e1b56a3321c

explore/src/assets/openaire-theme

@@ -1 +1 @@
-Subproject commit 3b874be6dfb7041f358c2ba86d3e1ec4e58f388b
+Subproject commit 35ab282e53ad5b7790bc431820a4400cfc36c977