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https://issues.apache.org/jira/browse/GUACAMOLE-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17783768#comment-17783768
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Mike Jumper commented on GUACAMOLE-1879:
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What do you see when you try the same sequence of key presses at
https://guacamole.apache.org/pub/tests/key-event-test.html ?
I suspect this isn't a bug in Guacamole per se, but some attempt by Lenovo or
Windows to provide a Ctrl+Alt keypress for applications that might be expecting
it (older Windows applications used Ctrl+Alt instead of a dedicated AltGr key).
There is nothing within Guacamole's keyboard handling that would result in
Guacamole itself interpreting an AltGr press as involving Ctrl unless there is
truly an event being dispatched to the browser stating that the Ctrl key has
been pressed, let alone something that would be time-dependent.
> AltGr on Italian keyboard mapped to Left Control+AltGr
> ------------------------------------------------------
>
> Key: GUACAMOLE-1879
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1879
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole
> Affects Versions: 1.5.3
> Environment: Browser: Version 118.0.5993.118 (Official Build) (64-bit)
> OS: WIndows 10 Enterprise
> Reporter: Cristian Consonni
> Priority: Major
>
> I can replicate this issue using the tester:
> https://guacamole.apache.org/pub/tests/guac/keyboard-test.html
> Input method: English (UK) with Italian keyboard.
> Tested both on external USB keyboard and built-in laptop (Lenove ThinkPad)
> keyboard.
> Browser: Version 118.0.5993.118 (Official Build) (64-bit)
> OS: WIndows 10 Enterprise
> If I press AltGr once I get:
> {code}
> guacamole keydown 0xffe3 Left control
> guacamole keyup 0xffe3 Left control
> guacamole keydown 0xfe03 AltGr
> guacamole keyup 0xfe03 AltGr
> {code}
> If I keep it pressed and then released it is even weirder because I get
> {code}
> guacamole keydown 0xffe3 Left control
> guacamole keyup 0xffe3 Left control
> guacamole keydown 0xfe03 AltGr
> guacamole keydown 0xffe3 Left control
> guacamole keyup 0xffe3 Left control
> guacamole keyup 0xfe03 AltGr
> {code}
> This interferes (on a Ubuntu remote server) with using AltGr as the Alternate
> characters key, it just does not work. The workaround that I am using at the
> moment is that I have changed the "Alternate Characters key" in the keyboard
> settings on the server to the "Menu key".
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