It’s really annoying when Visual Studio shows you this:

But github or vim shows you the same file like this:

If you use the “show whitespace” Visual Studio chord (CTRL-R, CTRL-W),
you’ll see that visual studio inserts tabs instead of spaces by
default for newline indent:

Visual Studio displays tabs as having the same
width as four spaces. But if you’re collaborating with someone working
in another text editor like vim, your automatically-inserted tabs will
appear larger than four spaces.

Here’s how to make visual studio insert spaces instead of tabs on newline indents:
go to Tools->Options->Text Editor->All Languages->Tabs:

That’s better: