title: change xxx-sources.jar download's directory in intellij idea in sbt projects
body: <p>there is a <strong>scala sbt project</strong> that created by <strong>intellij idea</strong>, and I add <code>libraryDependencies += "org.apache.logging.log4j" % "log4j-core" % "2.12.1"</code> into <code>build.sbt</code>.</p>
  
  <p><code>log4j-core-2.12.1.jar</code> was saved into <code>~/.ivy2/cache/org.apache.logging.log4j/log4j-core/jars/</code>.<br>
  when I check <strong>log4j-core</strong> source code, intellij idea show:  </p>
  
  <p><a href="https://i.stack.imgur.com/LwMVQ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LwMVQ.jpg" alt="enter image description here"></a></p>
  
  <p>I click <strong>Download...</strong> to download <code>source code</code>, I find <code>log4j-core-2.12.1-sources.jar</code> was saved in <code>~/.ideaLibSources/</code>.  </p>
  
  <p><a href="https://i.stack.imgur.com/5KkTr.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5KkTr.jpg" alt="enter image description here"></a></p>
  
  <p>but I want to save <code>log4j-core-2.12.1-sources.jar</code> to <code>~/.ivy2/cache/org.apache.logging.log4j/log4j-core/srcs/</code>, and if I download <code>commons-io-2.6-sources.jar</code>, I want to save it into <code>~/.ivy2/cache/commons-io/commons-io/srcs/</code>, how to do?   </p>