[Webkit-unassigned] [Bug 248387] New: [iOS] Double-space to insert period is not working in a contenteditable paragraph

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248387

            Bug ID: 248387
           Summary: [iOS] Double-space to insert period is not working in
                    a contenteditable paragraph
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ocavue at gmail.com
                CC: wenson_hsieh at apple.com

Created attachment 463752

  --> https://bugs.webkit.org/attachment.cgi?id=463752&action=review

The HTML file to reproduce this bug

## Bug description 

On iOS Safari, when I have multiple paragraphs in a `<div contenteditable="true">` element, double-spaces to insert a period doesn't work well. 

## Reproduce steps 

- Use a web server to serve the `index.html`. You can find the source code of `index.html` at this [link](https://gist.github.com/ocavue/8d4139c40096cfa08780dc6d18f30e1c).
- Open this file with Safari on macOS and iOS.
- Put the cursor at the end the first `paragraph element.`. 
- Type a space, then a word, then two spaces. 

## Expected behavior

Double-pressing spaces to period works in both blue and red area. 

## Actual behavior 

iOS Safari only works in the blue area. Mac Safari works on both two areas. Particularly, on iOS, the first and second paragraph doesn't work, but the third (last) paragraph works well. 

The following two videos show the behavior on iOS and on macOS. 

https://user-images.githubusercontent.com/24715727/204239949-247aee00-3abc-418a-ab1b-f1aa02faa4db.MP4

https://user-images.githubusercontent.com/24715727/204240408-c92e569c-ca59-428b-a657-7e6d11c93b20.mp4

## Version 

- iOS: 16.1.1
- macOS: 12.6; Safari Version 16.1 (17614.2.9.1.13, 17614)

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