convert field to local: support fields used in multiple methods (IDEA-108517)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/convert2Local/afterMultipleMethods.java

@@ -0,0 +1,13 @@
+// "Convert to local" "true"
+class Test {
+
+    int getFoo1() {
+        int myFoo = 1;
+    return myFoo;
+  }
+
+  int getFoo2() {
+      int myFoo = 2;
+    return myFoo;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/convert2Local/beforeMultipleMethods.java

@@ -0,0 +1,14 @@
+// "Convert to local" "true"
+class Test {
+  private int my<caret>Foo;
+
+  int getFoo1() {
+    myFoo = 1;
+    return myFoo;
+  }
+
+  int getFoo2() {
+    myFoo = 2;
+    return myFoo;
+  }
+}