Fix exception in presentation when publishing poll while minimized

bigbluebutton-html5/imports/ui/components/media/styles.scss

@@ -66,15 +66,7 @@ $after-content-order: 3;
 }
 
 .hideOverlay {
-  visibility: hidden !important;
   position: absolute !important;
-  overflow: hidden !important;
-  clip: rect(0 0 0 0) !important;
-  width: 1px !important;
-  height: 1px !important;
-  margin: -1px !important;
-  padding: 0 !important;
-  border: 0 !important;
 }
 
 .floatingOverlay {

bigbluebutton-html5/imports/ui/components/presentation/component.jsx

@@ -412,7 +412,7 @@ class PresentationArea extends PureComponent {
     };
 
     const svgViewBox = `${viewBoxPosition.x} ${viewBoxPosition.y} `
-      + `${viewBoxDimensions.width} ${viewBoxDimensions.height}`;
+      + `${viewBoxDimensions.width} ${Number.isNaN(viewBoxDimensions.height) ? 0 : viewBoxDimensions.height}`;
 
     return (
       <div

bigbluebutton-html5/imports/ui/components/whiteboard/whiteboard-toolbar/styles.scss

@@ -29,6 +29,7 @@
   left: auto;
   bottom: 0;
   pointer-events: none;
+  z-index: 3;
 
   [dir="rtl"] & {
     margin: 0 0 0 var(--toolbar-margin);
@@ -42,10 +43,6 @@
   }
 }
 
-.toolbarContainer:hover{
-  z-index: 3;
-}
-
 .toolbarWrapper {
   width: 100%;
   display: flex;