IDEA-80573 GitCheckoutOperation: sleep a bit to let file watcher report all changes for small repositories where refresh is too fast.

plugins/git4idea/src/git4idea/branch/GitCheckoutOperation.java

@@ -231,8 +231,22 @@ class GitCheckoutOperation extends GitBranchOperation {
 
   private static void refresh(GitRepository... repositories) {
     for (GitRepository repository : repositories) {
+      // If repository is small, everything can happen so fast, that FileWatcher wouldn't report the change before refresh() handles it.
+      // Performing a fair total refresh would be an overhead, so just waiting a bit to let file watcher report the change.
+      // This is a hack, but other solutions would be either performance or programming overhead.
+      // See http://youtrack.jetbrains.com/issue/IDEA-80573
+      sleepABit();
       refreshRoot(repository);
       // repository state will be auto-updated with this VFS refresh => no need to call GitRepository#update().
     }
   }
+
+  private static void sleepABit() {
+    try {
+      Thread.sleep(50);
+    }
+    catch (InterruptedException e) {
+      throw new RuntimeException(e);
+    }
+  }
 }