--collapsefolders = true not working for single sub-folders

[wdcossey]

I have an issue where --collapsefolders:true generates a .sln file that can't be loaded by Visual Studio (2022), it does work in Rider (just about).

The issue only happens when there's a single folder

- root
  - core
    - Project A
      - src
    - Project B
      - src
  - interface
    - Project C
      - src

slngen will generate the first folder core fine but the other interface will fail, as it tries to generate a solution folder with an invalid name

Example:

Project("{}") = "interface / Project C", "root\interface", "{}"

[michael-hawker]

Is this the same as #438?

[glards]

I experienced the same issue today. After investigating, it seems to be a regression from #495 in v10.2.0. I got around it by downgrading the tool to v10.0.0.

The root cause is that the separator for folder name was changed to '/' which causes Visual Studio to not load the projects under the folders with the following error:

Solution Folder names cannot:

• contain any of the following characters: / ? : \ * "" < > |
• contain Unicode control characters
• contain surrogate characters
• be system reserved names, including 'CON', 'AUX', 'PRN', 'COM1' or 'LPT2'
• be '.' or '..'

The previous code was using character '\u0338'.