https://bugs.freedesktop.org/show_bug.cgi?id=82689

          Priority: medium
            Bug ID: 82689
          Assignee: [email protected]
           Summary: VIEWING: U+3000 IDEOGRAPHIC SPACE (CJK full width
                    space) and other spaces not rendered as non-printing
                    characters in Writer
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: [email protected]
          Hardware: Other
            Status: UNCONFIRMED
           Version: 4.3.0.4 release
         Component: Writer
           Product: LibreOffice

U+3000 IDEOGRAPHIC SPACE, which is a wide space used in CJK text, does not show
visibly as a non-printing character when View -> Non-printing Characters is
enabled in Writer.

Please see the attached document, which contains various sorts of space (ensure
that View -> Non-printing Characters is enabled).

Currently, U+0020 SPACE and U+00A0 NO-BREAK SPACE are rendered correctly, but
there are various other sorts of Unicode space which are not. While U+3000
IDEOGRAPHIC SPACE is almost certainly the most used of these, perhaps
consideration should be given to making all on this list of space characters
visible:

Non-zero-width spaces

U+2000 EN QUAD
U+2001 EM QUAD
U+2002 EN SPACE
U+2003 EM SPACE
U+2004 THREE-PER-EM SPACE
U+2005 FOUR-PER-EM SPACE
U+2006 SIX-PER-EM SPACE
U+2007 FIGURE SPACE
U+2008 PUNCTUATION SPACE
U+2009 THIN SPACE
U+200A HAIR SPACE
U+202F NARROW NO-BREAK SPACE
U+205F MEDIUM MATHEMATICAL SPACE
U+3000 IDEOGRAPHIC SPACE

Zero-width spaces

U+200B ZERO WIDTH SPACE
U+FEFF ZERO WIDTH NO-BREAK SPACE

(Interestingly, U+200B ZERO WIDTH SPACE shows as a sort of visible space
whether or not View -> Non-printing Characters is enabled. Perhaps the handling
of this should be unified with other non-printing characters?)

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