indents disappearing from output after previewing post

[MTVDNA]

As far as I can tell no formatting is included (when I use view source in the editor). Pasting with ctrl + shift + v makes no difference either.

Also, it seems that although only 1 space is removed when previewing, all tabs are removed:

Pasted using ctrl + v, 1 preview:

def get_protnumber2(prefix):
l = []
for attribute in dir(socket):
if attribute.startswith(prefix):
key = getattr(socket, attribute)
value = attribute

l.append((key,value))

return dict(l)

Pasted using ctrl + shift + v, 1 preview:

def get_protnumber2(prefix):
l = []
for attribute in dir(socket):
if attribute.startswith(prefix):
key = getattr(socket, attribute)
value = attribute

l.append((key,value))

return dict(l)

Pasted without preview:

def get_protnumber2(prefix):
	l = []
	for attribute in dir(socket):
		if attribute.startswith(prefix):
			key = getattr(socket, attribute)
			value = attribute
			
			l.append((key,value))
			
	return dict(l)

Edit:
apparently this is the exact same issue that was being discussed in this thread.