In python3 the mix of tabs and spaces is treated as an error, "TabError: inconsistent use of tabs and spaces in indentation", in other IDEs I tried there is a way to autofix this issue per line or per file.
Is there anything similar in kdevelop 5.0.3?

Regards

As per your other thread, just use Find+Replace in "Escape sequences" or Regex mode ... not sure if we need an extra feature for those two clicks.

Yes, it probably doesn't make a point for a feature.