fixed source root detection for java files in default package (IDEA-74616)

java/java-tests/testData/ide/sourceRootDetection/defaultPackage/src/MyClass.java

@@ -0,0 +1,2 @@
+public class MyClass {
+}

java/java-tests/testData/ide/sourceRootDetection/defaultPackageWithImport/src/MyClass.java

@@ -0,0 +1,9 @@
+import java.util.*;
+//aaa
+import java.io.OutputStream;
+
+/**
+ * my class
+ */
+public class MyClass {
+}

java/java-tests/testData/ide/sourceRootDetection/garbage/Garbage.java

@@ -0,0 +1 @@
+garbage

java/java-tests/testData/ide/sourceRootDetection/simple/src/pack/MyClass.java

@@ -0,0 +1,5 @@
+//comment
+package pack;
+
+public class MyClass {
+}

java/java-tests/testData/ide/sourceRootDetection/twoRoots/src1/abc/MyClass.java

@@ -0,0 +1,3 @@
+package abc;
+
+class MyClass{}

java/java-tests/testData/ide/sourceRootDetection/twoRoots/src2/Class2.java

@@ -0,0 +1,3 @@
+package xyz;
+
+public class Class2{}

java/java-tests/testData/ide/sourceRootDetection/withPrefix/MyClass.java

@@ -0,0 +1,4 @@
+package xxx.yyy;
+
+public class MyClass {
+}