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https://issues.apache.org/jira/browse/GUACAMOLE-1879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17784191#comment-17784191
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Mike Jumper commented on GUACAMOLE-1879:
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By the way, there _is_ a mitigation in Guacamole's keyboard handling intended
to automatically release Ctrl+Alt when it appears to be involved in typing and
is not part of a keyboard shortcut.
We make the assumption that keyboard shortcuts will generally only involve the
more basic characters, while more complex characters involving diacritics, etc.
while Ctrl+Alt held are likely to be attempts to type with AltGr. This only
takes effect after a character is attempted to be typed.
> 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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