The issue #606 seems to appear again in iPadOS 13.0 (17A5547d). Control-space doesn’t go through to the application but rather switches input languages, regardless of ”Capture control-space” setting. A workaround is to disable all alternative input languages and the emoji input method under the keyboard settings of system preferences.
Yep, we are aware about that. We have submitted radar to apple, but please, submit also. That way they will get attention to that issue.
Thank you.
I’m seeing this as well. I’ve reported it as beta feedback to them. Do they usually fix these sorts of things?
Yep, we are aware about that. We have submitted radar to apple, but please, submit also. That way they will get attention to that issue.
Can you provide or link to instructions on how to “submit radar to Apple” for those who don’t know?
Hi @treyharris
There is Feedback.app on betas. You should submit issue form there.
Also https://feedbackassistant.apple.com/ works.
Seems like it's not a bug anymore, and it's a "feature" of iOS 13.
Anyone who knows a bit more about iOS: Any clues on what can be done about this? I wonder which of these is preferable:
P.S: I wonder if it's best to remove the setting to catch ctrl+space or, at least, mention next to it that if multilanguage keyboards are enabled, it still won't work.
Update:
@filcab actually there is a way to catch ctrl+space on 13.4+
You can add custom press ctrl+space and assign it to ctrl+space.
We don't turn it by default, so other people can use ctrl+space to switch languages.
Blink 13.5.1 is released.
@yury Emacs user here! The custom press for ctrl+space workaround is okay, but it requires you to release the control key before issuing another control-key command, which I (as I’d guess many) do immediately afterwards to move the cursor. It really breaks the Emacs flow.
@tjim from Ish found this way to do it that seems to work really well.

Most helpful comment
You can add custom press ctrl+space and assign it to ctrl+space.
We don't turn it by default, so other people can use ctrl+space to switch languages.
Blink 13.5.1 is released.