Sketcher: Improve visibility on zoom

[maxwxyz]

Is there an existing issue for this?

• I have searched the existing issues

Problem description

From the FreeCAD Day 2024 Complaint Session
When zooming in complex sketch everything goes on top of each other.
If I have a constrained sketch with multiple constraints and multiple lines and everything, a complex sketch… and then do a bit of zoom out. All of the things coincide it is hard to see and select things.
When you zoom out on a dense sketch, everything goes on top of each other. So you can't select anything.

Related issues:

• [Problem] Dimension lines and size indications in the sketcher are reduced. #8723
• Sketcher: Display size and use of blue circles in Splines  #12425

Full version info

OS: Windows 11 build 22631
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.36807 (Git)
Build type: Release
Branch: main
Hash: cc96f2718e139d670e08c4226bdea9955a102ed6
Python 3.11.8, Qt 5.15.13, Coin 4.0.2, Vtk 9.2.6, OCC 7.7.2
Locale: German/Germany (de_DE)
Installed mods: 
  * 3DfindIT 1.2.0
  * BIM 2021.12.0
  * CfdOF 1.25.10
  * CurvedShapes 1.0.8
  * Curves 0.6.29
  * Defeaturing 1.2.2
  * fasteners 0.5.16
  * FEMbyGEN 2.1.0
  * freecad.gears 1.2.0
  * freecad_metal_workbench 0.0.1
  * OpenDark 2023.12.17
  * OpticsWorkbench 1.0.15
  * sheetmetal 0.4.11

Subproject(s) affected?

Sketcher

Anything else?

No response

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