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>