[Topology Checker] Allow check does not have dangles on a second layer

[mollymaitland]

What is the bug or the crash? - Topology Error

When running topology check 'must not have dangles', it shows red dots for every single end of line point regardless of whether it's snapped to the middle of a segment or vertex. this is regardless of whether its snapping to the same layer or a different one

Steps to reproduce the issue

go to topology
click spanner
select layer and must not have dangles
run
see error

Versions

QGIS version
3.28.4-Firenze
QGIS code revision
fd0fb72
Qt version
5.15.3
Python version
3.9.5
GDAL/OGR version
3.6.2
PROJ version
9.1.1
EPSG Registry database version
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
unknown
SpatiaLite version
5.0.1
QWT version
6.1.6
QScintilla2 version
2.13.1
OS version
Windows 10 Version 2009

Active Python plugins
AnotherDXF2Shape
1.2.5
Comsof-Designer
22.3
Mergin
2023.1
QPackage
1.5
quick_map_services
0.19.33
StreetView
3.2
db_manager
0.1.20
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

every member of my team experiences the same issue

[troopa81]

The actual code just check if the starting/ending points are connected to other starting/ending point, which is way far from what it is expected.

It could be adressed by this QEP while refactoring