[Webkit-unassigned] [Bug 205527] New: getClientRects(), getBoundingClientRect() for range that spans multi-lines differs depending on whether text is selected

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205527

            Bug ID: 205527
           Summary: getClientRects(), getBoundingClientRect() for range
                    that spans multi-lines differs depending on whether
                    text is selected
           Product: WebKit
           Version: WebKit Local Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dbates at webkit.org
                CC: mmaxfield at apple.com,
                    webkit-bug-importer at group.apple.com, zalan at apple.com

Created attachment 386273

  --> https://bugs.webkit.org/attachment.cgi?id=386273&action=review

Test

Steps to reproduce:

1. Open the attached test.

The results before selection and after selection should be identical! They are not.

Maybe this bug should be split into two: one for getClientRects() and one for getBoundingClientRect()? Filing one bug for now as I think the root cause will address both issues also since getBoundingClientRect() is spec'ed to use the result of getClientRects().

I suspect the difference is due to whether we are using simple line layout (the "before selection" result) and line box layout (the "after selection case"). Simple line layout does not appears to return a rect when the selection is at the boundary. In the test case this is the box that represents the " " at the end of the first line, which also happens to coincide with where the text wraps. Simple line layout does not account for this and simply returns the rects from the second line! Line box layout does account for this. I made sure it did as part of the fix for bug #160786.

I suspect ^^^ is also the reason why getBoundingClientRect() returns differing results.

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