field can be local extended: suggest read only fields used in e.g. constructor once as can be local; process inner class constructors as methods (IDEA-52670)

java/java-tests/testData/inspection/fieldCanBeLocal/innerClassConstructor/expected.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems/>

java/java-tests/testData/inspection/fieldCanBeLocal/innerClassConstructor/src/Test.java

@@ -0,0 +1,11 @@
+public class Outer {
+  private int value = 0;
+
+  public class Inner {
+    private final int myValue;
+
+    public Inner() {
+      myValue = value++;
+    }
+  }
+}

java/java-tests/testData/inspection/fieldCanBeLocal/localVar2InnerClass/expected.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems>
+  <problem>
+    <file>Test.java</file>
+    <line>2</line>
+    <problem_class severity="WARNING" attribute_key="WARNING_ATTRIBUTES">Field can be local</problem_class>
+    <description>Field can be converted to a local variable</description>
+  </problem>
+</problems>

java/java-tests/testData/inspection/fieldCanBeLocal/localVar2InnerClass/src/Test.java

@@ -0,0 +1,11 @@
+public class Outer {
+  private int value = 0;
+
+  public class Inner {
+    private final int myValue;
+
+    public Inner() {
+      myValue = value;
+    }
+  }
+}