Bug 1523562 [wpt PR 14805] - [LayoutNG] Fix crash when inserting element inside a :first-line pseudo., a=testonly

Automatic update from web-platform-tests [LayoutNG] Fix crash when inserting element inside a :first-line pseudo. We were incorrectly trying to Split a LayoutInline as we didn't have this check. In LayoutNG we create an anonymous LayoutInline wrapper for the first-line pseudo which we weren't accounting for. See: https://cs.chromium.org/chromium/src/third_party/blink/renderer/core/layout/layout_block_flow.cc?l=3175 Bug: 920583 Change-Id: I2736a65eae4c12f9d25a51bb17949818c495d87c Reviewed-on: https://chromium-review.googlesource.com/c/1405884 Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org> Commit-Queue: Emil A Eklund <eae@chromium.org> Reviewed-by: Emil A Eklund <eae@chromium.org> Reviewed-by: Koji Ishii <kojii@chromium.org> Cr-Commit-Position: refs/heads/master@{#621834} -- wpt-commits: a302d8c671834920f0eba92133047bc0c85f18dd wpt-pr: 14805
2019-01-31 18:31:03 +00:00 · 2019-01-31 18:31:03 +00:00 · 86917914fd
--- a/testing/web-platform/tests/css/css-pseudo/first-line-first-letter-insert-crash.html
+++ b/testing/web-platform/tests/css/css-pseudo/first-line-first-letter-insert-crash.html
@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<title>Should not crash when inserting an element inside a :first-line pseudo.</title>
+<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/">
+<style>
+p:first-line, p:first-letter {
+  font-family: serif;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<p id=target>
+  test<sup>sup</sup>
+</p>
+<script>
+test(()=>{
+  const target = document.getElementById('target');
+  target.insertBefore(document.createElement('img'), target.lastChild)
+});
+</script>