EA-26800 drop caches in the completion file copy

java/java-tests/testData/codeInsight/completion/normal/MapsInvalidation.java

@@ -0,0 +1,9 @@
+class Foo extends Super {
+    public void f<caret>oo() {
+    }
+}
+
+class Super {
+    public void foo() {
+    }
+}