| Summary: | Repeated load/save/close cycles result in some flipped / mirrored drawing objects changing position over time. | ||
|---|---|---|---|
| Product: | LibreOffice | Reporter: | brianjheisler <brianjheisler> |
| Component: | Draw | Assignee: | Not Assigned <libreoffice-bugs> |
| Status: | NEW --- | ||
| Severity: | normal | CC: | birnbach, brianjheisler, himajin100000, rb.henschel, stephane.guillou, telesto |
| Priority: | high | ||
| Version: | Inherited From OOo | ||
| Hardware: | All | ||
| OS: | All | ||
| See Also: | https://bugs.documentfoundation.org/show_bug.cgi?id=152883 | ||
| Whiteboard: | |||
| Crash report or crash signature: | Regression By: | ||
| Bug Depends on: | |||
| Bug Blocks: | 108741 | ||
| Attachments: |
Demo File for Reproducing Drifting Drawing Object Bug
More Detailed Shape Drift Demo Incl un-Mirrored Shape |
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Description
brianjheisler@gmail.com
2020-04-11 17:25:43 UTC
Created attachment 159492 [details]
Demo File for Reproducing Drifting Drawing Object Bug
Repro with Version: 7.0.0.0.alpha0+ (x64) Build ID: 95ec2e9b024ff12a3005777c902d7e0975460b1d CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win; Locale: nl-NL (nl_NL); UI-Language: en-US Calc: CL and with Versie: 4.4.7.2 Build ID: f3153a8b245191196a4b6b9abd1d0da16eead600 Locale: nl_NL and in Versie 4.0.0.3 (Bouw-id: 7545bee9c2a0782548772a21bc84a9dcc583b89 It moves with 2/100 mm. It happens because the rectangle is mirrored and mirroring is done at the middle of the rectangle. And because of integer arithmetic "middle" might be off by one. As long as we have position and size in integer, I see no solution. You should investigate, whether in other "drifting" cases, mirrored objects are involved too. For the given example, you can try, whether it becomes better, if you remove the mirroring from the rectangles. Mirroring of rectangles is useless. Thanks Regina! I "un-Mirrored" the large rectangle and the drift stopped happening. Unfortunately, when I mirrored the grouped object (something I have to do a lot when I use LO Draw) the drifting returned. I fear this will render the mirroring feature somewhat problematic. I can't say that I fully understand why the mirroring operation cannot notice when the "middle" of an object won't be the "true middle" of an object and drop to the right a half-step so it will be aligned as it was before the mirroring. The fact that the error here continually accumulates each time the position data is transferred from disk to ram then back to disk has me confused. The error should happen once (@ 1/2 resolution) then stop. Anyway... I've been experimenting with various combinations of mirroring (both individual objects and grouped objects) as well as rotating grouped objects. It appears that any mirroring - either at the object level or the grouped level - causes drifting with objects but these objects have to be of certain sizes. (Repositioning causes problems with the large rectangle but never the small rectangle... in this example.) I will attach a second demo file to show my results. Created attachment 159525 [details]
More Detailed Shape Drift Demo Incl un-Mirrored Shape
I did some experimental orientation changes to the object to see when the problem occurs and when it does not. Additional notes for each test case are in the document.
Dear brianjheisler@gmail.com, To make sure we're focusing on the bugs that affect our users today, LibreOffice QA is asking bug reporters and confirmers to retest open, confirmed bugs which have not been touched for over a year. There have been thousands of bug fixes and commits since anyone checked on this bug report. During that time, it's possible that the bug has been fixed, or the details of the problem have changed. We'd really appreciate your help in getting confirmation that the bug is still present. If you have time, please do the following: Test to see if the bug is still present with the latest version of LibreOffice from https://www.libreoffice.org/download/ If the bug is present, please leave a comment that includes the information from Help - About LibreOffice. If the bug is NOT present, please set the bug's Status field to RESOLVED-WORKSFORME and leave a comment that includes the information from Help - About LibreOffice. Please DO NOT Update the version field Reply via email (please reply directly on the bug tracker) Set the bug's Status field to RESOLVED - FIXED (this status has a particular meaning that is not appropriate in this case) If you want to do more to help you can test to see if your issue is a REGRESSION. To do so: 1. Download and install oldest version of LibreOffice (usually 3.3 unless your bug pertains to a feature added after 3.3) from https://downloadarchive.documentfoundation.org/libreoffice/old/ 2. Test your bug 3. Leave a comment with your results. 4a. If the bug was present with 3.3 - set version to 'inherited from OOo'; 4b. If the bug was not present in 3.3 - add 'regression' to keyword Feel free to come ask questions or to say hello in our QA chat: https://web.libera.chat/?settings=#libreoffice-qa Thank you for helping us make LibreOffice even better for everyone! Warm Regards, QA Team MassPing-UntouchedBug This is re:2022-04-13 re-test request I've tested this and this bug is still present. Version: 7.4.3.2 (x64) / LibreOffice Community Build ID: 1048a8393ae2eeec98dff31b5c133c5f1d08b890 CPU threads: 8; OS: Windows 6.1 Service Pack 1 Build 7601; UI render: Skia/Raster; VCL: win Locale: en-US (en_US); UI: en-US Calc: CL *** Bug 152505 has been marked as a duplicate of this bug. *** Reproduced in recent trunk build: Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: ff3fb42b48c70ba5788507a6177bf0a9f3b50fdb CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: gtk3 Locale: en-AU (en_AU.UTF-8); UI: en-US Calc: threaded Also in OOo 3.3, so issue is inherited. |