Custom dash pattern changes when I change line stroke width

[VaclavC]

What is the bug or the crash?

I have defined a custom dash pattern (7mm dash 8mm space). It looks differently depending on line stroke width. Following screenshots are for line width 0,2mm and 0,4mm. There are two states of the dash pattern: one for "small" line width and second one for "bigger" line width.

Steps to reproduce the issue

1. Create a scratch layer with LineString geometry
2. Draw some line there
3. Set layer symbology to Single Symbol / Simple line
4. Create custom dash pattern for the line (I have 7mm dash and 8mm space, but exact values seems to be insignificant)
5. Try to set Stroke width to different values (for me it occurs between 0,2mm and 0,4mm)
6. Observe the pattern carefully

Versions

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

QGIS version	3.40.3-Bratislava
QGIS code revision	2a274ab
Libraries
Qt version	5.15.3
Python version	3.10.12
GDAL/OGR version	3.4.1
PROJ version	8.2.1
EPSG Registry database version	v10.041 (2021-12-03)
GEOS version	3.10.2-CAPI-1.16.0
SQLite version	3.37.2
PDAL version	2.3.0
PostgreSQL client version	14.15 (Ubuntu 14.15-0ubuntu0.22.04.1)
SpatiaLite version	5.0.1
QWT version	6.1.4
QScintilla2 version	2.11.6
OS version	Ubuntu 22.04.5 LTS
Active Python plugins
katastralnimapa	0.1
gml_application_schema_toolbox	1.3.1
stahovanikm	0.1
joinmultiplelines	Version 0.4.1
basemaps	1.0
qgis-ruian-plugin	1.2.1
db_manager	0.1.20
grassprovider	2.12.99
processing	2.12.99
MetaSearch	0.3.6

QGIS version 3.40.3-Bratislava QGIS code revision [2a274ab](https://github.com/qgis/QGIS/commit/2a274ab7754)

Libraries
Qt version
5.15.3
Python version
3.10.12
GDAL/OGR version
3.4.1
PROJ version
8.2.1
EPSG Registry database version
v10.041 (2021-12-03)
GEOS version
3.10.2-CAPI-1.16.0
SQLite version
3.37.2
PDAL version
2.3.0
PostgreSQL client version
14.15 (Ubuntu 14.15-0ubuntu0.22.04.1)
SpatiaLite version
5.0.1
QWT version
6.1.4
QScintilla2 version
2.11.6
OS version
Ubuntu 22.04.5 LTS

Active Python plugins
katastralnimapa
0.1
gml_application_schema_toolbox
1.3.1
stahovanikm
0.1
joinmultiplelines
Version 0.4.1
basemaps
1.0
qgis-ruian-plugin
1.2.1
db_manager
0.1.20
grassprovider
2.12.99
processing
2.12.99
MetaSearch
0.3.6

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