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https://issues.apache.org/jira/browse/GUACAMOLE-442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16305692#comment-16305692
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Michael Jumper commented on GUACAMOLE-442:
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It's not a question of whether the behavior is a bug. What you desire is simply
not possible.
Guacamole actually already handles the loss of focus. When focus on the browser
is lost, Guacamole automatically releases all held keys, including "Alt".
Keep in mind that when you press "Alt", Guacamole necessarily *must* send that
key over to the remote desktop. Doing otherwise would mean that intentionally
pressing "Alt" would not work as expected. When focus to the browser is lost
due to Alt+Tab, Guacamole releases "Alt" automatically, but "Alt" has already
been pressed. There is no way for Guacamole to change the past and not have
forwarded your "Alt" press in the first place, nor is there any way for
Guacamole to psychically know that your "Alt" press is not meant for the remote
desktop but for the local OS.
> While pressing alt+tab key to switch screen and then again alt+tab key to
> back on the rdp screen. It loses the focus.
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: GUACAMOLE-442
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-442
> Project: Guacamole
> Issue Type: Improvement
> Components: guacamole-common-js
> Affects Versions: 0.9.13-incubating
> Environment: All Browsers
> Reporter: Amarjeet Singh
> Priority: Minor
>
> I opened Notepad++ in RDP. Focus is on Notepad++ . I pressed alt+tab key to
> switch screen.
> alt key go to the server desktop and highlights File menu of Notepad. I
> copied text from local clipboard and came back to the same screen by pressing
> alt+tab. it loses the focus as it is on File menu. we have to click on the
> screen to gain focus.
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