[Webkit-unassigned] [Bug 222376] [css-grid] Replace the use of -1 with WTF::nullopt

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222376

--- Comment #20 from zsun at igalia.com ---
Created attachment 423222

  --> https://bugs.webkit.org/attachment.cgi?id=423222&action=review

Patch

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