tdody.deleteRow(-1) and tr.deleteCell(-1) should not throw when there are no rows / cells

[Chris Dumez]

tdody.deleteRow(-1) and tr.deleteCell(-1) should not throw when there are no rows / cells:
- https://html.spec.whatwg.org/multipage/tables.html#dom-tbody-deleterow
- https://html.spec.whatwg.org/multipage/tables.html#dom-tr-deletecell

Firefox and Chrome do not throw but WebKit does.

Covered by:
http://w3c-test.org/html/semantics/tabular-data/the-tbody-element/deleteRow.html
http://w3c-test.org/html/semantics/tabular-data/the-tr-element/deleteCell.html

[Radar WebKit Bug Importer]

<rdar://problem/27232261>

[Chris Dumez]

Created attachment 283071 [details]
Patch

[Ryosuke Niwa]

Comment on attachment 283071 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=283071&action=review

> Source/WebCore/html/HTMLTableRowElement.cpp:134
>          index = numCells-1;

Why don't we just return early here instead when numCells is 0?
Also, can we add spaces around -?

> Source/WebCore/html/HTMLTableSectionElement.cpp:92
> -    else
> +    else if (index != -1)

Ditto about returning early when index == -1.

[Chris Dumez]

Created attachment 283096 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 283096 [details]
Patch

Clearing flags on attachment: 283096

Committed r202952: <http://trac.webkit.org/changeset/202952>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.