[Webkit-unassigned] [Bug 234393] New: Web Inspector: Crash when moving cursor mid-token after receiving CSS property name completions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234393

            Bug ID: 234393
           Summary: Web Inspector: Crash when moving cursor mid-token
                    after receiving CSS property name completions
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rcaliman at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

Created attachment 447359

  --> https://bugs.webkit.org/attachment.cgi?id=447359&action=review

Video recording of bug

*Steps to reproduce*

- Click to add a new CSS declaration in the Styles sidebar
- Type `margin` in the name field
- Without committing, move the cursor to the beginning of the name: `|margin` 
- Type the letter `s`

See attached video.

*Result*
Web Inspector crashes with unhandled exception due to the cursor position being out of range.

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