tested on microsoft edge, windows 10
? works. have to have the editor not in focus though, otherwise you’re typing a question mark. second press closes the list.
ctrl+shift+R works. also opens ‘replace all’ if the editor is focused though
ctrl+shift+U works. second press doesn’t close it 
ctrl+P, ctrl+K, ctrl+; work.
ctrl+I works. second press restores it
ctrl+shift+M works. this one’s handy if you want glitch to make a checkpoint right now. second press closes it. also selects a bunch of stuff in the editor, this could come in handy
esc works in the keyboard shortcuts list. glitch doesn’t have a lot of dialogs though, can’t really think of a lot of other things to test it in
ctrl+shift+E I’m too scared to test
ctrl+shift+L works. you can even do it in other people’s projects, although it doesn’t show anything
ctrl+shift+X works. second press closes it, but only once you move focus out of the actual terminal. otherwise it’s pressing ctrl+shift+X in the terminal
ctrl+F works. make sure the editor is focused though, because otherwise the browser search comes up and it’ll say it’s not found even though the thing you’re searching for is in the document
ctrl+alt+F works. actually I can’t close this with the “X” button. the ESC shortcut key does get you out of it though. glad we learned about that just now
ctrl+G instead opens the find tool. please correct 
ctrl+shift+F works. I believe this is done by running grep -r in the project container
ctrl+alt+S I’ll test when I’m ready to give up on who I am