Bug 153488 – [meta][css-grid] Support implicit grid before explicit grid

• Status: RESOLVED
• Resolution: FIXED
• Component: Layout and Rendering

[Manuel Rego Casasnovas]

In our current implementation the implicit grid is only after the explicit grid.

For example, in a 2x2 grid, if you have an item with:
  grid-row: 3;
An implicit 3rd row is created.

However, if you have an item like:
  grid-column: -4;
We should be creating an implicit column before the first one.

This has been already implemented on Blink (http://crbug.com/444011)
following a plan described in this document (http://bit.ly/1j3CRdi).

We should port these patches to WebKit as the grid layout code has the same issues.

This will be used as meta-bug for all the patches related.

More info in the spec: http://dev.w3.org/csswg/css-grid/#line-placement

[Manuel Rego Casasnovas]

We've a TODO in GridResolvedPosition class:
// TODO(rego): Rename class to GridPositionsResolver.

This was already done in Blink:
https://codereview.chromium.org/1648903002/

[Manuel Rego Casasnovas]

(In reply to comment #1)
> We've a TODO in GridResolvedPosition class:
> // TODO(rego): Rename class to GridPositionsResolver.
> 
> This was already done in Blink:
> https://codereview.chromium.org/1648903002/

Sorry this comment was for bug #155486.

[Manuel Rego Casasnovas]

With the last refactorings this task has been completed.