Created attachment 82692 [details]
Miao Unicode keyboard + layout

When typing into Writer any *supplementary plane* char mapped to the AltGr or shift-AltGr states, a square, a crossed box, or simply nothing is produced, effectively blocking output of these SMP chars.  By contrast, AltGr-mapped *BMP* chars are OK, as are *supplementary plane* chars mapped to normal or shift states.  There is also no problem typing AltGr-mapped *supplementary plane* chars into Calc & Impress.  These chars can also be readily produced with (shift-)AltGr in other apps like Word & Excel.

This problem is attested in the following build & OS:
- AOO410m1(Build:9750) Rev. 1570848 on 64-bit English Windows 7 Ultimate SP1

It is expected that this problem will also manifest in later nightly builds.

A. Steps to reproduce bug with Miao (U+16F00..16F9F):
1. download & install Miao Unicode font at https://github.com/phjamr/MiaoUnicode/blob/master/MiaoUnicode-Regular.ttf?raw=true
2. unzip Miao1v2_.zip attached & install Miao keyboard (run setup.exe)
3. run Writer & set all Basic Fonts (CTL) to Miao Unicode (in Tools|Options|OpenOffice Writer)
4. select Miao Unicode font
5. on Windows language bar, select MR
6. refer to the 3 .jpg files in attached archive for keys mapped in each state
7. type any mapped keys in AltGr state: squares & crossed boxes appear -- BUG!!!
8. exit AOO

B. Steps to reproduce bug with Tengwar (re-encoded at U+1CC00..1CC7F for testing):
1. unzip tengmod.zip attached
2. install Tengwar font (right-click tengmod.ttf & select Install)
3. install Tengwar keyboard (run setup.exe)
4. run Writer
5. select Tengwar Telcontar Mod font
6. on Windows language bar, select IS
7. refer to the 4 .jpg files in attached archive for keys mapped in each state
8. type any mapped keys in AltGr or shift-AltGr state: squares & nothing appear -- BUG!!!

C. Control experiments with SMP chars mapped to normal or shift states:
1. repeat A.4-6
2. type any mapped keys in normal or shift state: Miao chars appear in document -- expected
3. repeat B.5-7
4. type any mapped keys in normal or shift state: Tengwar chars appear in document -- expected
5. exit AOO

D. Control experiment with BMP chars (Hebrew):
1. download & install SBL Hebrew font at http://www.sbl-site.org/Fonts/SBL_Hbrw.ttf
2. download & install SBL Hebrew Tiro keyboard at http://www.sbl-site.org/Fonts/BiblicalHebrewTiro.zip
3. download & refer to SBL Hebrew Tiro keyboard layout at http://www.sbl-site.org/Fonts/BiblicalHebrewTiroManual.pdf
4. run Writer & select SBL Hebrew font
5. on Windows language bar, select HE
6. type any mapped keys in AltGr or shift-AltGr state: Hebrew chars (+ Latin punctuation) appear as expected

E. Control experiments with other apps:
1. open Calc/Impress/Word/Excel/PowerPoint: blank document appears
2. repeat A.4-7: Miao chars (big letters with wart) appear in document -- expected
3. repeat B.5-8: Tengwar chars (+ Latin punctuation) appear in document -- expected

F. Observation: Writer may be cutting off the 2nd half of the surrogate pair that represents a supplementary char, as suggested by the following tests:
1. in Writer, repeat A.4-6
2. repeat A.7 multiple times, keeping all chars (i.e., crossed boxes) on the same line
3. copy the whole line & paste into Word: a line of squares appear
4. in Word, place cursor after any square
5. press Ctrl-X: the string D81B appears, which is the Unicode code point of the 1st half of any surrogate pair representing chars in the Miao block => 2nd half cut off
6. in Writer, repeat B.5-7
7. repeat B.8 multiple times, keeping all chars (i.e., square + nothing) on the same line
8. repeat F.3-5: it shows the value D833 = USV of high surrogate of any char in Tengwar block (per this test font) => low surrogate cut off