MOBILE-3947 iframe: Fix error when setting allowfullscreen
Now this attribute needs to be static
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				@ -11,9 +11,17 @@
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        </ion-button>
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    </core-navbar-buttons>
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    <iframe #iframe class="core-iframe" [attr.id]="id" [ngStyle]="{'width': iframeWidth, 'height': iframeHeight}" [src]="safeUrl"
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        [attr.allowfullscreen]="allowFullscreen ? 'allowfullscreen' : null" [class.core-iframe-loading]="loading">
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    </iframe>
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    <!-- allowfullscreen cannot be set dynamically using attribute binding, define 2 iframe elements. -->
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    <ng-container *ngIf="allowFullscreen">
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        <iframe #iframe class="core-iframe" [attr.id]="id" [ngStyle]="{'width': iframeWidth, 'height': iframeHeight}" [src]="safeUrl"
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            allowfullscreen="true" [class.core-iframe-loading]="loading">
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        </iframe>
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    </ng-container>
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    <ng-container *ngIf="!allowFullscreen">
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        <iframe #iframe class="core-iframe" [attr.id]="id" [ngStyle]="{'width': iframeWidth, 'height': iframeHeight}" [src]="safeUrl"
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            [class.core-iframe-loading]="loading">
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        </iframe>
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    </ng-container>
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    <ion-button *ngIf="!loading && displayHelp" expand="block" fill="clear" (click)="openIframeHelpModal()" aria-haspopup="dialog"
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        class="core-button-as-link core-iframe-help">
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@ -85,12 +85,6 @@ export class CoreIframeComponent implements OnChanges, OnDestroy {
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        this.initialized = true;
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        this.iframeWidth = (this.iframeWidth && CoreDomUtils.formatPixelsSize(this.iframeWidth)) || '100%';
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        this.iframeHeight = (this.iframeHeight && CoreDomUtils.formatPixelsSize(this.iframeHeight)) || '100%';
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        this.allowFullscreen = CoreUtils.isTrueOrOne(this.allowFullscreen);
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        this.showFullscreenOnToolbar = CoreUtils.isTrueOrOne(this.showFullscreenOnToolbar);
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        this.autoFullscreenOnRotate = CoreUtils.isTrueOrOne(this.autoFullscreenOnRotate);
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        if (this.showFullscreenOnToolbar || this.autoFullscreenOnRotate) {
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            // Leave fullscreen when navigating.
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            this.navSubscription = Router.events
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@ -157,6 +151,22 @@ export class CoreIframeComponent implements OnChanges, OnDestroy {
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     * Detect changes on input properties.
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     */
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    async ngOnChanges(changes: {[name: string]: SimpleChange }): Promise<void> {
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        if (changes.iframeWidth) {
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            this.iframeWidth = (this.iframeWidth && CoreDomUtils.formatPixelsSize(this.iframeWidth)) || '100%';
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        }
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        if (changes.iframeHeight) {
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            this.iframeHeight = (this.iframeHeight && CoreDomUtils.formatPixelsSize(this.iframeHeight)) || '100%';
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        }
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        if (changes.allowFullscreen) {
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            this.allowFullscreen = CoreUtils.isTrueOrOne(this.allowFullscreen);
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        }
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        if (changes.showFullscreenOnToolbar) {
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            this.showFullscreenOnToolbar = CoreUtils.isTrueOrOne(this.showFullscreenOnToolbar);
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        }
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        if (changes.autoFullscreenOnRotate) {
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            this.autoFullscreenOnRotate = CoreUtils.isTrueOrOne(this.autoFullscreenOnRotate);
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        }
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        if (!changes.src) {
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            return;
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        }
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