strange change of the indention to 3 spaces

[metulburr]

def foo():
"""This is just some dummy code"""
  
    a=0
    for n in range(10):
        a+=n
    return a

def foo():
"""This is just some dummy code"""
  
    a=0
    for n in range(10):
        a+=n
    return a

def foo():
"""This is just some dummy code"""
  
    a=0
    for n in range(10):
        a+=n
    return a