REGRESSION(r88757): [Chromium] Vertical position of media slider thumb is wrong.

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[Kent Tamura]

If the height of the <input> is smaller than the height of the thumb, we should center the thumb position vertically.

[Kent Tamura]

Created attachment 97220 [details]
Patch

[Kent Tamura]

(In reply to comment #1)
> Created an attachment (id=97220) [details]
> Patch

This will fix 12 tests listed in test_expectations.txt.

[Hajime Morrita]

Comment on attachment 97220 [details]
Patch

r=me.

[Dimitri Glazkov (Google)]

Comment on attachment 97220 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=97220&action=review

> Source/WebCore/rendering/RenderSlider.cpp:106
> +        thumbBox->setY(thumbBox->y() - (heightDiff / 2) - borderTop());

What about padding, or margins?

[Kent Tamura]

Comment on attachment 97220 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=97220&action=review

>> Source/WebCore/rendering/RenderSlider.cpp:106
>> +        thumbBox->setY(thumbBox->y() - (heightDiff / 2) - borderTop());
> 
> What about padding, or margins?

Oh, it's a good point.
We should take account of padding, and margin is ignorable.
Well, I have just realized we'd like to center the thumb for the *content* of the <input>, not the border-box. So,

    int heightDiff = thumbBox->height() - contentHeight();
    if (heightDiff > 0)
        thumbBox->setY(thumbBox->y() - (heightDiff / 2));

is the correct code.  I'll land the patch with this fix.

[Kent Tamura]

Committed r88901: <http://trac.webkit.org/changeset/88901>