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https://issues.apache.org/jira/browse/GUACAMOLE-1186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17203048#comment-17203048
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Mike Jumper commented on GUACAMOLE-1186:
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When Guacamole loses and regains focus, it attempts to read the local clipboard
(as it may have changed). If the browser allows this, and the clipboard has
changed, it streams the clipboard contents to the server, resyncing the remote
end with the local clipboard.
> Clipboard issue that can't paste the image data when changing the focus
> -----------------------------------------------------------------------
>
> Key: GUACAMOLE-1186
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1186
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-client, guacamole-server
> Affects Versions: 1.2.0
> Environment: Ubuntu 18.04 64bit, Windows 10 64 bit
> Reporter: Jimmy
> Priority: Major
> Labels: features
> Attachments: apache-guacd-clipboard-issue.mp4,
> xfreerdp-clipboard-issue.mp4
>
>
> I found one clipboard issue when working on the remote server over the apache
> guacamole client built from the latest source.
>
> The test case follows as below:
> # Connect to the remote server (Windows 10, 64bit) via the Apache Guacamole
> Client.
> # Open NotePad, type some text, press Ctrl+A to select all text, copy it by
> pressing Ctrl+C.
> # Open WordPad and press Ctrl+V to paste the clipboard.
> # Open Paint, draw any shapes, press CTrl+A to select all, and press Ctrl+C
> to copy it.
> # Select WordPad to press Ctrl+V to paste the clipboard.
> # Move the focus from Chrome with the opened guacamole client to another
> application.
> # Move back to the guacamole client page of Chrome.
> # Select WordPad to press Ctrl+V to paste the clipboard.
>
> In step 8, we can see the issue.
> That's, we can't paste the image, but can paste only the text copied in the
> previous step.
>
> When performed the above test case in the FreeRDP (xfreerdp) and the MS RDP
> client (mstsc.exe), I can't see this issue.
>
> For more information, please see the attached video files.
>
> Thanks.
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