mike-jumper commented on PR #1196:
URL: 
https://github.com/apache/guacamole-client/pull/1196#issuecomment-4174740475

   > When a user releases Shift before a character key, the browser reports the 
unshifted keysym on keyup, creating a mismatched press/release pair where the 
shifted keysym is never explicitly released. Over time, this leaves orphaned 
pressed-key state and causes seemingly random uppercase characters in the 
remote session.
   
   @amswiatkowski I'm not sure this is true. The following takes effect when 
the `KeyupEvent` is initially created:
   
   
https://github.com/apache/guacamole-client/blob/4245fbb7e2224e43141e4e5833647a38988edd0b/guacamole-common-js/src/main/webapp/modules/Keyboard.js#L377-L380
   
   If a user releases a key that isn't already known to be pressed, the current 
behavior is already to maintain consistency with the keysym used most recently 
for the key having that JavaScript keycode.


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