[Feature Request] Visual indicator for mouse selection type

[NXTler]

Is there an existing issue for this?

• I have searched the existing issues

Problem description

Hello all,
as of now, FreeCAD has two ways to select a group of objects with the mouse. When dragging the mouse from left to right, you select the objects that are completely within the rectangular. When dragging the mouse from right to left, you select the objects that lie inside and also those that intersect with the rectangular border.
It's very useful, and many CAD software programs also have this feature. However, new users have no way of telling which one they are currently using or have no idea that there are two different options. My request is to color the rectangle based on which option will be used, here are some quick visualizations I did (maybe have the colors customizable):

Full version info

OS: Manjaro Linux (KDE/plasma)
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.36731 (Git) AppImage
Build type: Release
Branch: main
Hash: ac1d887336826c59321352f49a195bf1ef8be2f0
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: 
  * PieMenu 1.2.7
  * sheetmetal 0.4.2
  * A2plus 0.4.63
  * QuickMeasure 2022.10.28
  * Curves 0.6.23
  * CfdOF 1.25.2
  * IconThemes
  * fasteners 0.5.12

Subproject(s) affected?

Sketcher

Anything else?

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[maxwxyz]

@obelisk79 DWG for Sketcher UI / colors