Bug 125513 - White rendering artefacts between Writer pages on macOS
Summary: White rendering artefacts between Writer pages on macOS
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
(earliest affected)
Hardware: All All
: lowest trivial
Assignee: Not Assigned
Depends on:
Blocks: Writer-Page-Break
  Show dependency treegraph
Reported: 2019-05-26 22:28 UTC by Thorsten Wagner
Modified: 2023-04-17 14:26 UTC (History)
4 users (show)

See Also:
Crash report or crash signature:

Screenshot (10.05 KB, image/png)
2019-05-26 22:28 UTC, Thorsten Wagner
macOS 11.2.2 LO no repro (375.61 KB, image/png)
2021-03-06 15:19 UTC, steve

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Description Thorsten Wagner 2019-05-26 22:28:28 UTC
In Writer thin white lines remain between pages while scrolling from time to time, expecially before/after page breaks (see screenshot).

Steps to Reproduce:
(1) Open Writer

(2) Create new document

(3) Insert some text for more than a page

(4) Insert a page break

(5) Scroll forth and back until issue becomes visible

Actual Results:
Rendering artefacts remain between pages as thin white lines while scrolling

Expected Results:
Page borders are rendered without remaining rendering artefacts

Reproducible: Always

User Profile Reset: No

OpenGL enabled: Yes

Additional Info:
Issue was present in previous version of LO too. It seems better with current revision from master, but issue has not disappeared completely. Issue does not seem to be related to OpenGL.
Comment 1 Thorsten Wagner 2019-05-26 22:28:52 UTC
Created attachment 151690 [details]
Comment 2 Alex Thurgood 2019-05-28 07:18:13 UTC
@Thomas : not really sure what I'm supposed to be seeing here. I occasionally see a sort of grey line (rather than white) superimposed between the pages as I scroll down or up, is that what you are referring to ?
Comment 3 Alex Thurgood 2019-05-28 07:20:26 UTC
Forget that, I can confirm this with

Build ID: 92b0b8d78d69bd917842b09af7888b402144baeb
CPU threads: 4; OS: Mac OS X 10.14.4; UI render: default; VCL: osx; 
Locale: fr-FR (fr_FR.UTF-8); UI-Language: en-US
Calc: threaded

I just had to make sure that several pages were filled.
Comment 4 Xisco Faulí 2019-05-30 11:56:10 UTC
What is the artifact on the screenshot? the white tinny line ?
Comment 5 Thorsten Wagner 2019-05-30 22:43:08 UTC
Yes, in the case shown by screenshot there is one thin white line. Depending on scrolling there are situations with two or three of such lines too.
Comment 6 steve 2021-03-06 15:18:36 UTC
Unable to reproduce
macOS 11.2.2
Version: / LibreOffice Community
Build ID: fe0b08f4af1bacafe4c7ecc87ce55bb426164676
CPU threads: 8; OS: Mac OS X 10.16; UI render: default; VCL: osx
Locale: de-DE (de_DE.UTF-8); UI: en-US
Calc: threaded

@Thorsten: is this still happening for you and if yes, on which macOS?

Setting to wfm, please re-open should this be persisting for you.
Comment 7 steve 2021-03-06 15:19:10 UTC
Created attachment 170271 [details]
macOS 11.2.2 LO no repro
Comment 8 Thorsten Wagner 2021-03-06 15:31:20 UTC
Yes, this still happends (from time to time). Maybe it is caused by current implementation of alpha blending. Discovered this issue on Linux/UNIX too in the meantime. Reverted the status to "new".
Comment 9 steve 2021-03-07 09:16:01 UTC
Thanks for double checking. If anybody discovers repro steps would be nice to share as I was unable to find any.
Comment 10 Telesto 2021-03-07 09:58:37 UTC
(In reply to Thorsten Wagner from comment #8)
> Yes, this still happends (from time to time). Maybe it is caused by current
> implementation of alpha blending. Discovered this issue on Linux/UNIX too in
> the meantime. Reverted the status to "new".

Thing is pretty common, have seen this on Windows too
Comment 11 QA Administrators 2023-03-19 03:25:37 UTC
Dear Thorsten Wagner,

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.

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