Merge pull request #1083 from jitsi/fix_hover_thumbnail

fix(Thubmnail_PopupMenu): the thumbnail should be considered hovered when the popup menu is hovered

modules/UI/util/JitsiPopover.js

     JitsiPopover.prototype.forceHide = function () {
         $(".jitsipopover").remove();
         this.popoverShown = false;
+        if(this.popoverIsHovered) { //the browser is not firing hover events
+            //when the element was on hover if got removed.
+            this.popoverIsHovered = false;
+            this.onHoverPopover(this.popoverIsHovered);
+        }
     };
 
     /**

modules/UI/videolayout/RemoteVideo.js

     this.bindHoverHandler();
     this.flipX = false;
     this.isLocal = false;
+    this.popupMenuIsHovered = false;
     /**
      * The flag is set to <tt>true</tt> after the 'onplay' event has been
      * triggered on the current video element. It goes back to <tt>false</tt>
     };
     let element = $("#" + this.videoSpanId + " .remotevideomenu");
     this.popover = new JitsiPopover(element, options);
+    this.popover.addOnHoverPopover(isHovered => {
+        this.popupMenuIsHovered = isHovered;
+        this.updateView();
+    });
 
     // override popover show method to make sure we will update the content
     // before showing the popover
     }.bind(this);
 };
 
+/**
+ * Checks whether current video is considered hovered. Currently it is hovered
+ * if the mouse is over the video, or if the connection indicator or the popup
+ * menu is shown(hovered).
+ * @private
+ * NOTE: extends SmallVideo's method
+ */
+RemoteVideo.prototype._isHovered = function () {
+    let isHovered = SmallVideo.prototype._isHovered.call(this)
+        || this.popupMenuIsHovered;
+    return isHovered;
+};
+
 /**
  * Generates the popup menu content.
  *