Soft breaks not detected in macOS Safari

[peteshilling]

Description
Soft breaks (shift + enter) are interpreted as hard breaks in Safari. They are detected correctly in Chrome. I tested the 'is-hotkey' library and 'shift+enter' works fine in Safari, so the bug must be somewhere in the Slate library. If no one has any ideas I can dig deeper and attempt to identify the issue.

Sandbox
https://codesandbox.io/s/slate-reproductions-forked-kxss7c?file=/index.tsx

Steps
To reproduce the behavior:

1. Visit the sandbox above in Safari
2. Focus the editor and press shift + enter
3. An alert will appear saying that a hard break, not a soft break, was detected

Expectation
Soft breaks should be detected in Safari as they are in Chrome.

Environment

• Slate Version: 0.94.1
• Operating System: macOS 13.2.1
• Browser: Safari 16..3

Context
One of the requirements for my editor is that hard and soft breaks are treated differently (double space vs single space)

[lauigi]

I don't think it is a bug of slate. Please check this demo out: https://developer.mozilla.org/en-US/docs/Web/API/InputEvent/inputType . The behaviour is as same as your demo.
I also found this issue: ckeditor/ckeditor5#13321

And, the "is-hotkey" lib seems only to be using under no HAS_BEFORE_INPUT_SUPPORT env. Enters are handled here:

slate/packages/slate-react/src/components/editable.tsx

Line 676 in a81f76f

case 'insertLineBreak':

I suppose that there could be a new feature like checking the shift key's status in some ways if you wanna separate line breaks in safari

[peteshilling]

Thanks for your reply, @frellica. It looks like you are correct, I wasn't looking deep enough. For whatever reason Safari has designated control+return for the insertLineBreak event type.

I may end up making a special rule for this, since our users expect shift + return to produce a line break, but it doesn't seem like something that Slate should need to account for.