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https://issues.apache.org/jira/browse/FOP-2438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Doucha updated FOP-2438:
-------------------------------
Attachment: test.fo
Example of the bug. The only relevant part are lines 3 and 4:
<fo:block xmlns:d="http://docbook.org/ns/docbook"; text-align="start"
text-align-last="justify">Test Test Test</fo:block>
<fo:block xmlns:d="http://docbook.org/ns/docbook"; text-align="justify"
text-align-last="justify">Test Test Test</fo:block>
Line 3 triggers the bug, line 4 gets rendered correctly. The actual file
contains U+00A0 instead of , I've changed it here to highlight which
space is which.
> Non-breaking space causes alignment problems with text-align-last="justify"
> ---------------------------------------------------------------------------
>
> Key: FOP-2438
> URL: https://issues.apache.org/jira/browse/FOP-2438
> Project: Fop
> Issue Type: Bug
> Affects Versions: 1.1, trunk
> Reporter: Martin Doucha
> Attachments: test.fo
>
>
> Non-breaking spaces are not included in stretch factor calculation under
> special circumstances but they are stretched by the resulting (oversized)
> stretch factor, leading to text overflowing out of block. Those special
> circumstances are:
> - text-align-last="justify"
> - text-align="start" (or anything else other than justify)
> - the non-breaking space has to get positioned on the last line of the block
> Here's Knuth sequence for block "Test Test Test" with the above
> alignment settings:
> <KnuthSequence [box w=17220, glue w=2500 stretch=1250 shrink=0, box w=17220,
> aux. box w=2500, box w=17220, penalty p=-INFINITE w=0 (forced break, ???
> (-1))]>
> Notice that the second space is represented as box instead of glue with
> penalty.
> Here's Knuth sequence for the same block but this time with alignment
> justify/justify:
> <KnuthSequence [box w=17220, glue w=2500 stretch=1250 shrink=833, box
> w=17220, aux. box w=0, aux. penalty p=INFINITE w=0, glue w=2500 stretch=1250
> shrink=833, box w=17220, penalty p=-INFINITE w=0 (forced break, ??? (-1))]>
> This gets rendered correctly.
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