tree 14fdd021f930fb222042a521661e18f726e3794b
parent 606c30c7ddee97a0b6840dc56fae97ed2724e7da
author Ana SollanoKim <ansollan@microsoft.com> 1639099491 -0800
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1639101202 -0800

[GridNG] Not crashing when we have grid with a subgridded axis

This CL fixes a crash that happens when we try to position an item in a
grid with a subgridded axis and an auto repeater track list.

According to the spec https://www.w3.org/TR/css-grid-2/#subgrid-listing
"If there is no parent grid, this value is equivalent to the initial
value, none." In |grid_position_resolver| we check for this and only use
the serialized grid line names when they turn out to be valid.

Added two new tests to validate the behavior with in-flow and out-of-
flow items.

Bug: 618969, 1275398
Change-Id: I2bc2e368b73329cd7f01af9d3849a61e869f5db4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3312291
Reviewed-by: Ethan Jimenez <ethavar@microsoft.com>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Ana Sollano Kim <ansollan@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#950370}