double line style and acute angle or short line length

[T3xtM4rk3r]

What is the bug or the crash?

Hi There,

when using a double line symbology qgis ignores or fails to display the lines wenn acute angle oder short line lengths are present.

Steps to reproduce the issue

linestyle_issue.zip

1. Load layer pasted from linestyle_issue geopackage. Two closed line loops should be visible.
   

2. Go to layer symbology, add second line with offset 0,26 and stroke width 0,26

4. For one part in each line the doubled line gets ignored
   

5. For both lines the black line appears when zooming in a lot. I assume that for the right loop the short segment at the nordwest part of the single styled part is responsible for the 'faulty' display of the line style. For the left loop maybe the angle at the bottom is too small?
   

Versions

<style type="text/css"> p, li { white-space: pre-wrap; } </style>

QGIS-Version	3.32.3-Lima	QGIS-Codeversion	67d4610
Qt-Version	5.15.3
Python-Version	3.9.5
GDAL-Version	3.7.2
PROJ-Version	9.3.0
EPSG-Registraturdatenbankversion	v10.094 (2023-08-08)
GEOS-Version	3.12.0-CAPI-1.18.0
SQLite-Version	3.41.1
PDAL-Version	2.5.5
PostgreSQL-Client-Version	15.2
SpatiaLite-Version	5.1.0
QWT-Version	6.1.6
QScintilla2-Version	2.13.4
BS-Version	Windows 10 Version 2009
Aktive Python-Erweiterungen
db_manager	0.1.20
grassprovider	2.12.99
MetaSearch	0.3.6
processing	2.12.99

QGIS-Version 3.32.3-Lima QGIS-Codeversion [67d4610](https://github.com/qgis/QGIS/commit/67d46100b5) Qt-Version 5.15.3 Python-Version 3.9.5 GDAL-Version 3.7.2 PROJ-Version 9.3.0 EPSG-Registraturdatenbankversion v10.094 (2023-08-08) GEOS-Version 3.12.0-CAPI-1.18.0 SQLite-Version 3.41.1 PDAL-Version 2.5.5 PostgreSQL-Client-Version 15.2 SpatiaLite-Version 5.1.0 QWT-Version 6.1.6 QScintilla2-Version 2.13.4 BS-Version Windows 10 Version 2009

Aktive Python-Erweiterungen
db_manager
0.1.20
grassprovider
2.12.99
MetaSearch
0.3.6
processing
2.12.99

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[agiudiceandrea]

@T3xtM4rk3r, thanks for reporting. It seems to me the issue you are experiencing may be the same previously reported at #51583. Could you please have a look at it?

[github-actions]

The QGIS project highly values your report and would love to see it addressed. However, this issue has been left in feedback mode for the last 14 days and is being automatically marked as "stale".
If you would like to continue with this issue, please provide any missing information or answer any open questions. If you could resolve the issue yourself meanwhile, please leave a note for future readers with the same problem and close the issue.
In case you should have any uncertainty, please leave a comment and we will be happy to help you proceed with this issue.
If there is no further activity on this issue, it will be closed in a week.

[github-actions]

While we hate to see this happen, this issue has been automatically closed because it has not had any activity in the last 42 days despite being marked as feedback. If this issue should be reconsidered, please follow the guidelines in the previous comment and reopen this issue.
Or, if you have any further questions, there are also further support channels that can help you.