Backstory: some Linux distributions setup a keyboard shortcut to let you enter Unicode characters, and they use CTRL + SHIFT + U as that shortcut. As a programmer, I want to instead use that shortcut in my code editor, so I'd like to disable the system one ... but I can't seem to figure out what program is responsible for it.
Everything I've found (eg. in this question about re-enabling that shortcut: How to re-enable the Ctrl+Shift+U shortcut in Cinnamon Mint 17.3?) suggests that it's dependent on my IME (input method editor). But when I went to "Input Method" (in the system menu), it said I didn't have an IME selected.
I then tried switching to the Fcitx IME (since I would like to be able to type Japanese characters), but that didn't help. Also, I went through all of the Fcitx configuration, and couldn't find any mention of a CTRL + SHIFT + U shortcut in it.
My question is: how can I disable this global CTRL + SHIFT + U shortcut? Preferably with the Fcitx IME, but if I have to disable it I can.
I've found the solution which works:
https://superuser.com/a/1334194
Run whichever editor you have via:
GTK_IM_MODULE=xim youreditor
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