https://bugs.documentfoundation.org/show_bug.cgi?id=162502
Bug ID: 162502
Summary: Treat direction-neutral characters with language
according to their role in that language
Product: LibreOffice
Version: Inherited From OOo
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: LibreOffice
Assignee: [email protected]
Reporter: [email protected]
This bug depends on 148257 having been fixed, i.e. when we have stretches of
text which are explicitly/definitely marked as being in a certain language.
When this is the case, we should qualify the application of the Unicode
Bidirectional Algorithm when it comes to neutral characters like '-', '?',
western-arabic digits etc.:
When a directionality-character is marked as being in a language in which it
does not interrupt direction runs of text in that language, e.g. '-' for
English where everything is LTR, we should treat is as a strongly-directional
character with the directionality of that language.
Thus, for example, if I write "-fax" in an RTL paragraph, the visual layout
will be:
fax-
two runs, a 1-char RTL run and a 3-char LTR run. But if we mark this text as
being in English, we should see:
-fax
a single LTR run despite - being a neutral character in general - because we
know that the minus is part of a sequence of characters in English.
Caveat: Some languages may not have a single directionality, like Japanese; in
which case we should either treat the character as neutral or apply some other
logic.
------------------------------
Alternative, weaker option: Instead of treating the character as
strongly-directional, "bias" the neutral character direction so that it takes
its language's direction if the stretch of neutral chars has a stretch of chars
in its language either before or after it.
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