Writer: Up and down keys move cursor to random line positions instead of directly up or down

[Travisgevans]

Immediately after writing some text in Writer, using the up and down keyboard keys to move the text cursor results in the cursor moving to unpredictable horizontal positions on the adjacent line (or in rare cases, even *several* lines away) instead of in the expected position, directly above or below.

I tried it with a new user and fresh ~/.config/libreoffice profile, running in Unity, and could still reproduce the problem.

1. Open LibreOffice and start a new Writer document.

2. Type several lines of text uninterrupted and then, without ending the paragraph, attempt to move the cursor one line up with the keyboard

3. Contrast resulting cursor behavior to that of virtually every other word processor and text editor (it usually ends up anywhere except directly one line up or down, often appearing at the very end or beginning of the line or somewhere entirely different instead).

4. Repeatedly pressing up or down immediately after this may make the inconsistent movement more obvious (it starts to behave normally, and then after more text is typed it jumps around incorrectly again with up/down movement).

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: libreoffice-core 1:5.1.4-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: X-Cinnamon
Date: Thu Jul 21 02:07:30 2016
ExecutablePath: /usr/lib/libreoffice/program/soffice.bin
InstallationDate: Installed on 2016-04-11 (100 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: libreoffice
UpgradeStatus: Upgraded to xenial on 2016-04-26 (85 days ago)
XsessionErrors:
 (process:5806): indicator-sound-WARNING **: volume-control-pulse.vala:744: Unable to connect to dbus server at 'unix:path=/run/user/1000/pulse/dbus-socket': Could not connect: No such file or directory
 (gnome-software:5821): Gs-WARNING **: Failed to create permission org.freedesktop.packagekit.trigger-offline-update: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Action org.freedesktop.packagekit.trigger-offline-update is not registered
 (gnome-software:5821): Gs-WARNING **: Failed to create permission org.freedesktop.packagekit.trigger-offline-update: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Action org.freedesktop.packagekit.trigger-offline-update is not registered
 cinnamon-session[5571]: WARNING: t+24.67429s: Could not launch application 'telepathy-indicator.desktop': Unable to start application: Failed to execute child process "telepathy-indicator" (No such file or directory)
 (cinnamon:5773): Cjs-WARNING **: JS ERROR: TypeError: this.actor is null

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.