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Bug 106310 - FILESAVE symmetric transition of Bézier point lost on save
Summary: FILESAVE symmetric transition of Bézier point lost on save
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Draw (show other bugs)
(earliest affected) release
Hardware: x86 (IA32) All
: medium minor
Assignee: Not Assigned
Depends on:
Reported: 2017-03-03 22:02 UTC by Regina Henschel
Modified: 2020-12-07 18:23 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:

Try file (7.97 KB, application/
2017-03-04 15:37 UTC, Jacques Guilleron

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Description Regina Henschel 2017-03-03 22:02:42 UTC
Disable any snapping. Create a Bézier curve with three anchor points. Set the middle anchor point to symmetric transition. Save the document and reload it. Examine the middle point. Does it still have a symmetric transition? If yes, move its control points and save and reload again.

Working with such curves often leads to a corner point after reloading. The reason is, that in that cases the path is not saved with the special path command "s" for a symmetric transition, but with the generic "c" command.

So this is a weakness in implementation. It seems to use the coordinates to determine whether it is a symmetric transition or not and fails because of one off rounding inaccuracy. Instead it should use the state, which was set by the user to determine a symmetric transition.
Comment 1 Jacques Guilleron 2017-03-04 15:37:09 UTC
Created attachment 131629 [details]
Try file

Hi Regina,

I tried this curve without success on
LO Build ID: f0c7cbe1d8505d3c1f5a2b2253efda35542c898b
CPU threads: 2; OS: Windows 6.1; UI render: GL; 
TinderBox: Win-x86@39, Branch:master, Time: 2017-02-22_04:35:00
Locale: fr-FR (fr_FR); Calc: CL

Comment 2 Buovjaga 2017-03-05 19:47:36 UTC
I could reproduce (from scratch).

Arch Linux 64-bit, KDE Plasma 5
Build ID: ed0e8f970ff552e75222dc92ed2879aa3b3e5851
CPU threads: 8; OS: Linux 4.9; UI render: default; VCL: kde4; 
Locale: fi-FI (fi_FI.UTF-8); Calc: group
Built on March 4th 2016
Comment 4 Regina Henschel 2017-04-01 21:06:40 UTC
No it is not related. The error still exists in Version:
Build ID: 6a59352290a5d05c4236522b56124ac06cd591ad
CPU threads: 4; OS: Windows 6.1; UI render: default; 
TinderBox: Win-x86@62-TDF, Branch:MASTER, Time: 2017-03-31_08:37:47
Locale: de-DE (de_DE); Calc: group
That build has the commit 26909d9de4c6e7165fc8f5d938ee6ef55b87cc5c already integrated.
Comment 5 Dennis Gearon 2017-12-06 04:26:40 UTC
Very similar to the problem they are having, but I just CAN'T save a file that has even ONE symmetric transition, bezier curved arrow in it. The error popup says:

"Error saving the document BypassFSM:
Write Error.
The file could not be written"

The minute I delete the one bezier curve that I've tried, the problem goes away. I do have some crashes some time later, but I am running Flash in Mozilla and Virtualbox with Windows7 in it at the same time and probably have put the computer asleep at least once by the time I get to a crash, so can't really blame Open Office Draw ....yet. 

I'm trying to draw some Control Flow diagrams for a PLC program and the Finite State Machines that are in my program, and I really need curved arrows. So for me, it's a show stopper.

PS, the keyword limited choices is EXTREMELY annoying.....
Comment 6 QA Administrators 2018-12-07 03:47:17 UTC Comment hidden (obsolete)
Comment 7 QA Administrators 2020-12-07 04:12:26 UTC Comment hidden (obsolete)
Comment 8 Regina Henschel 2020-12-07 18:23:01 UTC
The problem still exists in Version: (x64)
Build ID: 4e63ec27b69fa01ff610c894c9fbf05c377a6179
CPU threads: 8; OS: Windows 10.0 Build 19041; UI render: default; VCL: win
Locale: de-DE (en_US); UI: en-US
Calc: CL