If a non us-ascii character is used in the project path -> the debugger shows assembly language

If a non us-ascii character is used in the project path -> the debugger shows assembly language, not the expected source code.

Please, seeing that unjustified assembly code once and again maddens people, and affects a lot of developers, as it can be seen:

• in a comment on https://stackoverflow.com/q/47926779:
  "I had a Cyrillic letter in the project path... it was treacherous. After really Latin path setting the problem was solved."
• mentioned on https://stackoverflow.com/a/43596066/2660408:
  "Use only ASCII symbols in your 'project' and 'build' directory paths".
  (which is also mentioned in a comment in https://stackoverflow.com/questions/41007516/qt-creator-unable-to-switch-off-disassembly-view-in-debugger)

Thanks in the name of our mental health...