Sketcher: Trim does not work with an external line and a circle

Is there an existing issue for this?

• I have searched the existing issues

Problem description

Trim does not work with External lines, or maybe this is a specific use case that is missing to tackle.

Sample file: trim_issue_of_the_day.FCStd.zip

I want to trim this small edge (follow the arrow)

It is removing the whole circle.

Full version info

OS: Ubuntu 25.04 (ubuntu:GNOME/ubuntu-xorg/xcb)
Architecture: x86_64
Version: 1.1.0dev.14555 (Git shallow)
Build date: 2025/09/23 18:47:15
Build type: Release
Branch: main
Hash: e9ce06155d8d47aad7d6c079bfa8ba54df2b6081
Python 3.11.13, Qt 6.8.3, Coin 4.0.3, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide 6.8.3
shiboken 6.8.3, xerces-c 3.3.0, IfcOpenShell 0.8.2, OCC 7.8.1
Locale: English/United States (en_US)
Navigation Style/Orbit Style/Rotation Mode: Touchpad/Trackball/Drag at cursor
Stylesheet/Theme/QtStyle: OpenDark.qss/OpenDark/
Logical DPI/Physical DPI/Pixel Ratio: 96/94.0767/1
Installed mods: 
  * Assembly4.1 0.60.2-0.1
  * Cables 0.2.1
  * CurvesWB 0.6.64
  * FreeCAD-render 2024.12.15
  * Assembly4 0.60.2
  * sheetmetal 0.7.55
  * DynamicData 2.75.0
  * Curves 0.6.70
  * InventorLoader 1.5.1
  * diff-tools 0.1.0
  * ose-piping
  * Assembly4.1_mod 0.60.2-0.1
  * OpenTheme 2025.5.20
  * fasteners 0.5.42
  * Silk 0.2.0
  * osh-autodoc-workbench 0.2.3
  * CurvedShapes 1.0.13
  * freecad-povray-render
  * OpticsWorkbench 1.2.2
  * lattice2 1.0.0
  * kicadStepUpMod 11.7.6

Subproject(s) affected?

Sketcher

Anything else?

No response

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