[Bug 1800640] [NEW] Plane 1 (SMP) characters are not justified properly in Writer

[Miikka-Markus Alhonen]

Public bug reported:

Justifying paragraphs with Unicode Plane 1 (SMP) characters does not
work as expected. See the attached screenshot of a document with one
paragraph in Gothic (U+10330–U+1034F) and another one in Old Hungarian
(U+10C80–U+10CFF). Both paragraphs have been justified but visually only
the left edge seems aligned. If you try selecting words with the
keyboard or the mouse, the font metrics are totally off. In the attached
screenshot, I have selected the second word of the sentence (𐌼𐌰𐌽𐌽𐌰) but
visually it looks like two characters of the following word have been
selected as well. Both scripts display the same behavior although Gothic
is an LTR script and Old Hungarian is RTL.

Description:    Ubuntu 18.04.1 LTS
Release:        18.04

libreoffice-writer:
  Installed: 1:6.0.6-0ubuntu0.18.04.1
  Candidate: 1:6.0.6-0ubuntu0.18.04.1
  Version table:
 *** 1:6.0.6-0ubuntu0.18.04.1 500
        500 http://mr.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     1:6.0.3-0ubuntu1 500
        500 http://mr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: libreoffice-writer 1:6.0.6-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 30 11:31:48 2018
InstallationDate: Installed on 2017-02-13 (624 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fi_FI.UTF-8
 SHELL=/bin/bash
SourcePackage: libreoffice
UpgradeStatus: Upgraded to bionic on 2018-05-31 (151 days ago)

** Affects: libreoffice (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

** Attachment added: "Screenshot Plane 1 justification.png"
   
https://bugs.launchpad.net/bugs/1800640/+attachment/5207144/+files/Screenshot%20Plane%201%20justification.png

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Title:
  Plane 1 (SMP) characters are not justified properly in Writer

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