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https://issues.apache.org/jira/browse/GUACAMOLE-2084?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Jumper closed GUACAMOLE-2084.
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Resolution: Fixed
> "guac_display" may fail to send "sync" for frames consisting only of rects
> --------------------------------------------------------------------------
>
> Key: GUACAMOLE-2084
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-2084
> Project: Guacamole
> Issue Type: Bug
> Components: libguac
> Affects Versions: 1.6.0
> Reporter: Mike Jumper
> Assignee: Mike Jumper
> Priority: Major
> Fix For: 1.6.0
>
>
> {{guac_display}} relies on the worker threads to send the final frame
> {{sync}} instruction (the last thread to send anything also sends the final
> {{sync}}), but since the worker threads are only used for image encoding, a
> frame that contains no images at all will be missing its {{sync}}.
> This would be true of any update that consists only of a single colored
> rectangle, as {{guac_display}} optimizes these into a pair of {{rect}} and
> {{cfill}} to avoid sending image data. Closing a window over a solid black
> background would produce exactly such an update.
> See: https://lists.apache.org/thread/fxmp86kn216nyswo5dj0koq5h97ypbky
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