.mbedignore not works fully

[Reissner]

i have folder /file structure like that:

• Mbed
  • main.cpp
  • lib
    • inih
      • INIReaderTest.cpp

main.cpp is my main file containing method main
and Inih downloaded from https://github.com/jtilly/inih contains a file INIReaderTest.cpp with another main method.
Thus i need an .mbedignore.
If i place it in folder Mbed, it does not work, whereas in folder lib it does work.

Compliation is done with mbed compile --source . --source mbed-os --source lib

i use mbed version 1.10.2 with python 3.8.2 on linux

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/IOTBTOOL-650

[JanneKiiskila]

What does the .mbedignore file contain?