[Webkit-unassigned] [Bug 189454] New: REGRESSION (r235153): [iOS] Can't move selection start grabber when selecting text in a subframe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189454

            Bug ID: 189454
           Summary: REGRESSION (r235153): [iOS] Can't move selection start
                    grabber when selecting text in a subframe
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wenson_hsieh at apple.com
                CC: wenson_hsieh at apple.com

After r235153, I can't move the selection start grabber when selecting text in a subframe on iOS, if the subframe isn't at the very top of the main document. To reproduce:

1. Visit https://whsieh.github.io/examples/subframes
2. Scroll to the very bottom, where "lorem-tiny.html" is embedded in a subframe
3. Long press to select some text
4. Try to move the grabber at the start of the selection.

Expected: able to change the selection by moving the grabber.
Observed: the selection start grabber snaps to the character before the selection end grabber, and cannot be moved.

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