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Problem description

We'll discuss unconstrained geometry below. That is, sketch lines have degrees of freedom.
However, when lines that shouldn't be moved during construction, it's not very convenient.

For example, I have a triangle or lines converging to a point. I can move points or lines without any problem, while elements not included in the selection remain in place.

But as soon as I use fillet or chamfer, all movements cause a chain reaction, and lines that aren't included in the selection move.

I understand that fillet and chamfer have boundary conditions where they will inevitably cause changes to the entire geometry (for example, when the radius becomes very large). But changes shouldn't occur with even the slightest movement.

Video demonstration

In my opinion, the vertices located at the top right (figures with fillet and chamfer) are too mobile and should not move due to the slightest changes in the chamfer/fillet.

To describe the correct solution in brief, the radii of the chamfer and fillet should change (unless, of course, they are constraints). All adjacent straight lines should remain fixed, but could be lengthened or shortened to accommodate the chamfer.

Full version info

OS: Manjaro Linux (KDE/plasma/xcb)Architecture: x86_64Version: 1.1.0dev.20251104 (Git shallow) AppImageBuild date: 2025/11/04 19:07:44Build type: ReleaseBranch: mainHash: af014a1bb44264d749ba9522917f0d1ac76c4bbfPython 3.11.14, Qt 6.8.3, Coin 4.0.3, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide 6.8.3shiboken 6.8.3, xerces-c 3.3.0, IfcOpenShell 0.8.2, OCC 7.8.1Locale: Russian/Russia (ru_RU)Navigation Style/Orbit Style/Rotation Mode: Revit/Turntable/Drag at cursorStylesheet/Theme/QtStyle: unset/FreeCAD Classic/fusionLogical DPI/Physical DPI/Pixel Ratio: 96/91.7938/1Installed mods:* addFC-main 1.6.2* Reinforcement* SearchBar 1.8.0 (Disabled)* SvgWorkbench-main 1.0.0.dev5* PitchedRoof* LyapinWorkbrench* FreeCAD_FastenersWB-master 0.5.42* FreeCAD_SketchArch-master* MeshRemodel-master 1.10.38* FrameForge 0.1.5* Road 2025.2.22* Curves 0.6.70* freecad.gears 1.3.0* CurvedShapesWorkbench-master 1.0.13* Silk 0.2.0* sheetmetal 0.7.55* OpenTheme 2025.5.20* Manipulator-master 1.6.3* FreeCAD_ThreadProfile-master 1.97.0

Subproject(s) affected?

Sketcher

Anything else?

No response

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