title: how to use git diff show some invisible characters differences?
body: <p>When I use <code>git diff</code>, I saw the differences like below:</p>
  <pre><code>-    self.conv_2 = nn.Conv2d(C_in, C_out // 2, 1, stride=2, padding=0, bias=False) 
  +    self.conv_2 = nn.Conv2d(C_in, C_out // 2, 1, stride=2, padding=0, bias=False) 
  </code></pre>
  <p>And I'm sure there are no white backspace difference in these two lines.
  However, I think these two lines are totally same.</p>
  <p>I wonder why does git think they are different?</p>
  <p>And is there a way to let <code>git diff</code> show the special characters difference?</p>