[Webkit-unassigned] [Bug 210677] New: REGRESSION (r249160): Deleting newline after pasting text ending in a newline results in a discontinuity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210677

            Bug ID: 210677
           Summary: REGRESSION (r249160): Deleting newline after pasting
                    text ending in a newline results in a discontinuity
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
               URL: data:text/html,%3ctextarea%3e%3c/textarea%3e
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ddkilzer at webkit.org
                CC: dbates at webkit.org, koivisto at iki.fi,
                    mmaxfield at apple.com, wenson_hsieh at apple.com,
                    zalan at apple.com
        Depends on: 201181

Summary:
Pasting text that ends with a newline, then immediately deleting that newline, results in a discontinuity in a <textarea> element.

Steps to Reproduce
1. Load URL:  <data:text/html,%3ctextarea%3e%3c/textarea%3e>
2. Resize.
3. Type in "lorem\n\n\n\nipsum\n" (hit the Enter key for each newline).
4. Select "lorem" plus its ending newline and copy to pasteboard.
5. Position insertion bar on line 3 (blank line between "lorem and ipsum").
6. Paste text.
7. Immediately hit Delete key.

Expected Results:
Blank line should be deleted after pasting "lorem\n".

Actual Results:
Blank is deleted, but the text is not redrawn with the line removed.  Moving the insertion bar with left/right arrow keys will show it jump over the deleted newline.  (Using up/down arrow keys will actually not move the insertion bar past the deleted newline.)

Regression:
Via bisection, this regressed in r249160 which was the fix for Bug 201181:

Bug 201181: InlineTextBox::end() should return first-past-end offset
​<https://bugs.webkit.org/show_bug.cgi?id=201181>
<rdar://problem/54758922>
<https://trac.webkit.org/changeset/249160/webkit>


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=201181
[Bug 201181] InlineTextBox::end() should return first-past-end offset
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