Object Snap on Lines does not work for arc-elements

[MFessele]

What is the bug or the crash?

Object Snap on Lines does not work for arc-elements...

Steps to reproduce the issue

Used a sqlite-file containing polygons with arc-elements

Versions

worked in Version 3.16.16 , in all newer lts-Versions which i have tested, it does not work anymore...

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]

@MFessele, could you please provide the info requested in the issue report form?

In the QGIS Help menu -> About, click in the table, Ctrl+A and then Ctrl+C. Finally paste here. Do not make a screenshot.

[MFessele]

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

QGIS-Version	3.22.16-Białowieża	QGIS-Codeversion	6f08e4d
Qt-Version	5.15.3
Python-Version	3.9.5
GDAL-Version	3.6.2
PROJ-Version	9.1.1
EPSG-Registraturdatenbankversion	v10.076 (2022-08-31)
GEOS-Version	3.11.1-CAPI-1.17.1
SQLite-Version	3.39.4
PDAL-Version	2.4.3
PostgreSQL-Client-Version	14.3
SpatiaLite-Version	5.0.1
QWT-Version	6.1.6
QScintilla2-Version	2.13.1
BS-Version	Windows 10 Version 2009
Aktive Python-Erweiterungen
alkisplugin	2.0.54
OSMDownloader	1.0.3
parcel_plugin	3.8
Qgis2threejs	2.7.1
QuickOSM	2.1.1
QuickWKT	3.1
quick_map_services	0.19.32
db_manager	0.1.20
grassprovider	2.12.99
MetaSearch	0.3.5
processing	2.12.99
sagaprovider	2.12.99

QGIS-Version 3.22.16-Białowieża QGIS-Codeversion [6f08e4d](https://github.com/qgis/QGIS/commit/6f08e4d7) Qt-Version 5.15.3 Python-Version 3.9.5 GDAL-Version 3.6.2 PROJ-Version 9.1.1 EPSG-Registraturdatenbankversion v10.076 (2022-08-31) GEOS-Version 3.11.1-CAPI-1.17.1 SQLite-Version 3.39.4 PDAL-Version 2.4.3 PostgreSQL-Client-Version 14.3 SpatiaLite-Version 5.0.1 QWT-Version 6.1.6 QScintilla2-Version 2.13.1 BS-Version Windows 10 Version 2009

Aktive Python-Erweiterungen
alkisplugin
2.0.54
OSMDownloader
1.0.3
parcel_plugin
3.8
Qgis2threejs
2.7.1
QuickOSM
2.1.1
QuickWKT
3.1
quick_map_services
0.19.32
db_manager
0.1.20
grassprovider
2.12.99
MetaSearch
0.3.5
processing
2.12.99
sagaprovider
2.12.99

[agiudiceandrea]

@MFessele QGIS 3.22 is no longer supported. Could you please try if the issue does occur using a currently supported release and using a new QGIS user profile without external plugins installed?

[MFessele]

I also have tried with 3.28.6. Same issue. Thats why i still use 3.16.16, because there snapping on arcs has still worked....

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

QGIS-Version	3.28.6-Firenze	QGIS-Codeversion	868c9fa
Qt-Version	5.15.3
Python-Version	3.9.5
GDAL-Version	3.6.4
PROJ-Version	9.2.0
EPSG-Registraturdatenbankversion	v10.082 (2023-02-06)
GEOS-Version	3.11.2-CAPI-1.17.2
SQLite-Version	3.41.1
PDAL-Version	2.5.2
PostgreSQL-Client-Version	unknown
SpatiaLite-Version	5.0.1
QWT-Version	6.1.6
QScintilla2-Version	2.13.1
BS-Version	Windows 10 Version 2009
Aktive Python-Erweiterungen
alkisplugin	2.0.54
DigitizingTools	1.5.2
Qgis2threejs	2.7.1
quick_map_services	0.19.33
SRTM-Downloader	3.1.17
db_manager	0.1.20
grassprovider	2.12.99
MetaSearch	0.3.6
processing	2.12.99
sagaprovider	2.12.99

QGIS-Version 3.28.6-Firenze QGIS-Codeversion [868c9fa](https://github.com/qgis/QGIS/commit/868c9fa03b) Qt-Version 5.15.3 Python-Version 3.9.5 GDAL-Version 3.6.4 PROJ-Version 9.2.0 EPSG-Registraturdatenbankversion v10.082 (2023-02-06) GEOS-Version 3.11.2-CAPI-1.17.2 SQLite-Version 3.41.1 PDAL-Version 2.5.2 PostgreSQL-Client-Version unknown SpatiaLite-Version 5.0.1 QWT-Version 6.1.6 QScintilla2-Version 2.13.1 BS-Version Windows 10 Version 2009

Aktive Python-Erweiterungen
alkisplugin
2.0.54
DigitizingTools
1.5.2
Qgis2threejs
2.7.1
quick_map_services
0.19.33
SRTM-Downloader
3.1.17
db_manager
0.1.20
grassprovider
2.12.99
MetaSearch
0.3.6
processing
2.12.99
sagaprovider
2.12.99

[elpaso]

I cannot reproduce (using GPKG).

[MFessele]

i tried to reproduce the issue now also with an animated gif... it happens when i try to move a point of an existing element ( in this case a point of the green line) to touch an arc of an existing polygon (brown). the snapping marker is show correcty, but when commited the new point jumps to a diffrent location, which is not on the arc...

[alexbruy]

Fixed in 755dd48