title: Why is android studio decompiling classes from my projects when I open them?
body: <p>Android Studio was automatically updated on my system to to 4.0.1, from version 3.2, however since I found that 4.0.1 had potential bugs, I installed a previous version (3.5.3) and I when opening one of my projects which is only a small simple test project and seemed to take an age loading, the last dialog, I see before it opens is</p>
  <p>Title:  &quot;Loading Project...&quot;</p>
  <p>Body:   &quot;Decompiling class CountDownTimer.class</p>
  <p>when in previous versions I haven't seen this behaviour and I cant find any &quot;decompiler&quot; options in Settings either and the question is Why is Android Studio decompiling my class files, by default?  why would it need to? what is the rationale?</p>