[jira] [Updated] (GUACAMOLE-918) Guacamole Display not visible under Shadow DOM

["Jonas Zeiger (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GUACAMOLE-918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonas Zeiger updated GUACAMOLE-918:
-----------------------------------
    Environment: 
guacamole-common-js 1.1.0 on Chromium 78
org.apache.guacamole:guacamole-common:1.1.0 on OpenJDK 11


  was:
guacamole-common-js 1.1.0 on Chromium 78
org.apache.guacamole:guacamole-common:1.0.0 on OpenJDK 11



> Guacamole Display not visible under Shadow DOM
> ----------------------------------------------
>
>                 Key: GUACAMOLE-918
>                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-918
>             Project: Guacamole
>          Issue Type: Bug
>          Components: guacamole-common-js
>    Affects Versions: 1.1.0
>         Environment: guacamole-common-js 1.1.0 on Chromium 78
> org.apache.guacamole:guacamole-common:1.1.0 on OpenJDK 11
>            Reporter: Jonas Zeiger
>            Priority: Major
>         Attachments: guacamole-display-under-shadow-root.png
>
>
> The Guacamole display doesn't show when inserted under shadow DOM.
> The display is attached like this:
> {code:javascript}
> const wrapper = this.shadowRoot.getElementById('console-screen-wrapper');
> wrapper.style.width = '' + 640 + 'px';
> wrapper.style.height = '' + 480 + 'px';
> this.display = wrapper.appendChild(client.getDisplay().getElement());
> {code}
> The display elements including canvas are present in the DOM (see DOM screenshot).
> The reason seems to be the explicit canvas/layer z-index setup here:
> guacamole-common.js, Guacamole.Layer()
> {code:javascript}
>     // Explicitly render canvas below other elements in the layer (such as
>     // child layers). Chrome and others may fail to render layers properly
>     // without this.
>     canvas.style.zIndex = -1;
> {code}
> Setting canvas.style.zIndex to 0 instead of -1 makes all layers visible under shadow DOM.



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