Bug 69072 – White space between inline blocks should be affected by word-spacing property

• Component: CSS
• Status: RESOLVED FIXED

[Lev Solntsev]

Created attachment 109135 [details]
white-space processing test

According to fantasai message in www-style:
> http://www.w3.org/TR/CSS21/text.html#spacing-props
>   # Word spacing affects each space (U+0020) and non-breaking space (U+00A0),
>   # left in the text after the white space processing rules have been applied.
>  
> This means that
>  
> <inline-block/><inline-block/> will only be affected by letter-spacing, whereas
> <inline-block/> <inline-block/> will be affected by word-spacing.

— http://lists.w3.org/Archives/Public/www-style/2011Sep/0493.html

For now word-spacing property in Webkit doesn't affect white space between
inline blocks but does between usual words. Instead white space between
inline-blocks is affected by letter-spacing property.

Word-spacing property is widely used to eliminate spaces between inline-blocks
produced by code formatting white-spaces.

[Robert Hogan]

It looks like the place to do this with RenderStyle::wordSpacing() is in RenderBlock::computeInlinePreferredLogicalWidths()

[Jon Gjengset]

This seems to be similar to this Firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=761645

Simple example of the bug here: http://jon.thesquareplanet.com/inline-block-bug/

[Robert Hogan]

Created attachment 149175 [details]
Patch

[Robert Hogan]

Created attachment 149363 [details]
Patch

[Lev Solntsev]

Robert Hogan, probably you should change the authorship meta information in tests since you largely reworked those.

[Robert Hogan]

Hi Dan,

Could you take a look at this please?

Thanks,
Robert

[Levi Weintraub]

Comment on attachment 149363 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=149363&action=review

> Source/WebCore/rendering/InlineFlowBox.cpp:428
> +                // If we encounter any space after this inline block then ensure it is treated as the space between two words.
> +                needsWordSpacing = true;

Why don't we have to account for this in RenderBlock::computeInlinePreferredLogicalWidths?

> LayoutTests/fast/css/word-spacing-between-blocks-expected.html:9
> +    <link rel="author" title="Lev Solntsev" href="mailto:[e-mail]">
> +    <link rel="author" title="Robert Hogan">

You may want to address Lev's concerns.

> LayoutTests/fast/css/word-spacing-between-blocks-expected.html:28
> +<p>Following strings must be same:</p>

Since these are reworked, please give these tests a meaningful description and a link back to this bug.

[Robert Hogan]

Comment on attachment 149363 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=149363&action=review

>> Source/WebCore/rendering/InlineFlowBox.cpp:428
>> +                needsWordSpacing = true;
> 
> Why don't we have to account for this in RenderBlock::computeInlinePreferredLogicalWidths?

There, the word-spacing between inline blocks is account for by:

t->trimmedPrefWidths(inlineMax, beginMin, beginWS, endMin, endWS,
                                     hasBreakableChar, hasBreak, beginMax, endMax,
                                     childMin, childMax, stripFrontSpaces);

[Robert Hogan]

Created attachment 178617 [details]
Patch

[Levi Weintraub]

Comment on attachment 178617 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=178617&action=review

> LayoutTests/fast/css/word-spacing-between-blocks-expected.html:30
> +<!-- White space between inline blocks should be affected by the word-spacing property.
> +     https://bugs.webkit.org/show_bug.cgi?id=69072 -->

Is there a reason you made this a comment instead of allowing the description in the output?

[Levi Weintraub]

(In reply to comment #8)
> (From update of attachment 149363 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=149363&action=review
> 
> >> Source/WebCore/rendering/InlineFlowBox.cpp:428
> >> +                needsWordSpacing = true;
> > 
> > Why don't we have to account for this in RenderBlock::computeInlinePreferredLogicalWidths?
> 
> There, the word-spacing between inline blocks is account for by:
> 
> t->trimmedPrefWidths(inlineMax, beginMin, beginWS, endMin, endWS,
>                                      hasBreakableChar, hasBreak, beginMax, endMax,
>                                      childMin, childMax, stripFrontSpaces);

So beyond just failing to follow the intention of the spec, we're currently deciding to respect word-spacing for inline blocks *differently* during pref-width-calc and layout? Sadness :(

[Robert Hogan]

Created attachment 178622 [details]
Patch

[WebKit Review Bot]

Comment on attachment 178622 [details]
Patch

Clearing flags on attachment: 178622

Committed r137494: <http://trac.webkit.org/changeset/137494>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.