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This reply goes to every one who has offered their help. I just want to say
thank you. I have tried out LO on Ubuntu 12.04 and on Windows 7 in a VM, and
these issues are simply almost gone on the Linux platform but remain the
same on the virtual Windows. 

I will briefly answer all my questions in the following, with a short

Environment: Ubuntu 12.04 64bit in VMWare, clean install; LibreOffice, deb package; extra fonts copied from Windows to support CJK chars
in plane 2 (though the AR UL font also supports this), Tibetan script (using
Microsoft Himalaya), Burmese (not sure if Ubuntu has a supporting font so
just copied one), Gothic (using Code2000 fonts or Segoe UI Symbol) and more
signs (using Segoe UI Symbol).

♪͡♪♪͡♪Neil Ren♪͡♪♪͡♪ wrote

1. no unicode code point entry field in the dialog

This is UNNECESSARY for Ubuntu/Linux because I have learned it has
built-in support for direct keyboard input of unicode characters without
limitation found in Windows (that you can only enter a code point lower
than U+10000 using keyboard direct input).

♪͡♪♪͡♪Neil Ren♪͡♪♪͡♪ wrote
2. wrong detection of unicode ranges

This is NOT observed in LO on Ubuntu. All fonts are properly detected of
their supported unicode ranges. And yes, LO follows the Unicode Standard
in this.

♪͡♪♪͡♪Neil Ren♪͡♪♪͡♪ wrote
3. limited support for fonts with non-zero plane glyphs

This is NOT observed in LO on Ubuntu. Full range support for these fonts,
including those of which LO don't show their non-zero plane glyphs in

♪͡♪♪͡♪Neil Ren♪͡♪♪͡♪ wrote
4. no built-in mechanism to produce glyphs from typed code points

This is UNNECESSARY for Ubuntu/Linux. See issue 1.

♪͡♪♪͡♪Neil Ren♪͡♪♪͡♪ wrote
5. unstable detection of unicode ranges: weird behaviors in the Special  
Characters dialog

As of this post is composed, I haven't experienced any such behavior.
Seeing that the unicode ranges are also correctly detected and fully
supported here, I am confident this won't happen in Ubuntu/Linux.

♪͡♪♪͡♪Neil Ren♪͡♪♪͡♪ wrote
6. broken bi-di display (on same line ) in mixed-script document

This is NOT observed in LO on Ubuntu if you copy text from a web browser
or type in text. However, if you try to open an HTML page straight from
LO, which I do so only for testing, the display do get screwed up.

♪͡♪♪͡♪Neil Ren♪͡♪♪͡♪ wrote
7. Broken glyph display in mixed-script document

This is NOT observed in LO on Ubuntu if you assign a proper language to
the text. If you don't, the glyphs may show up as blobs, but once you set
it right, the glyphs are shown proper. Try it with Tibetan and Gothic.

♪͡♪♪͡♪Neil Ren♪͡♪♪͡♪ wrote
8. problematic character spacing

This is NOT observed in LO on Ubuntu if you assign a proper language to
the text. If you don't, the glyphs may display errneously, but once you
set it right, the glyphs are shown proper. Try it with Thai.

♪͡♪♪͡♪Neil Ren♪͡♪♪͡♪ wrote
9. wrong font information for mixed language documents

There is ongoing discussion of the issue of automatic font selection, but
at least you don't make your glyph go wrong by using a wrong font.

Verdict: Unicode support of LO is much better on Ubuntu/Linux than on
Windows, speaking of non-zero plane code points and complex scripts. This is
possibly due to originality of LO as a Linux application later ported to
Windows platform, and also due to Windows' running parallel in Unicode and
ANSI modes, the latter for backward compatibility.

I'll perhaps try LO out on a Windows 8.1 system in a VM if possible, and if
I do that I'll continue to update this post.

"雷聲 靐䨻": if you can see four Chinese characters instead of blobs or question marks than your 
browser/OS has a good support for Unicode and CJK characters! (P.S. the four chracters put together 
means "loud thunder")
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