Extract common conjunct from if-else chain in ExtractIfConditionAction

Fixes IDEA-179499 New inspection: Should break out common conjunct from "if / else if"

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/extractIfCondition/afterMissedBrackets.java

@@ -1,15 +1,13 @@
 // "Extract if (a)" "true"
 class TestThreadInspection {
   void f(boolean a, boolean b, boolean c){
-      if (a)
+      if (a) {
           if (b) {
               System.out.println("a&b");//first comment
-          } else {
-              if (c) {
-                  System.out.println("c");
-              }
+          } else if (c) {
+              System.out.println("c");
           }
-      else if (c) {
+      } else if (c) {
           System.out.println("c");
       }
   }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/extractIfCondition/afterRepeating.java

@@ -0,0 +1,13 @@
+// "Extract if (a)" "true"
+class Test {
+  void f(boolean a, boolean b, boolean c){
+      /*2*/
+      if (a) {
+          if (b) {
+              System.out.println("a&b");//first comment
+          } else if (c) {
+              System.out.println("a&c"); // three
+          }
+      }
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/extractIfCondition/afterRepeating2.java

@@ -0,0 +1,17 @@
+// "Extract if (a)" "true"
+class Test {
+  void f(boolean a, boolean b, boolean c, boolean d){
+      //a
+      if (a) {
+          if (b) {
+              System.out.println("a&b");//first comment
+          } else if (c) {
+              System.out.println("a&c");//ac
+          } else {
+              System.out.println("a");//a
+          }
+      } else if (d) {
+          System.out.println("d");//d
+      }
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/extractIfCondition/afterRepeating3.java

@@ -0,0 +1,17 @@
+// "Extract if (a)" "true"
+class Test {
+  void f(boolean a, boolean b, boolean c, boolean d){
+      //a
+      if (a) {
+          if (b) {
+              System.out.println("a&b");//first comment
+          } else {
+              System.out.println("a");//a
+          }
+      } else if (a && c) {
+          System.out.println("a&c");//ac
+      } else if (a && d) {
+          System.out.println("a&d");//ad
+      }
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/extractIfCondition/afterSimpleElse.java

@@ -1,13 +1,13 @@
 // "Extract if (a)" "true"
 class TestThreadInspection {
   void f(boolean a, boolean b, boolean c){
-      if (a)
+      if (a) {
           if (b) {
               System.out.println("a&b");
           } else {
               System.out.println("c");
           }
-      else {
+      } else {
           System.out.println("c");
       }
   }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/extractIfCondition/beforeRepeating.java

@@ -0,0 +1,10 @@
+// "Extract if (a)" "true"
+class Test {
+  void f(boolean a, boolean b, boolean c){
+    if (<caret>a && b)
+      System.out.println("a&b");//first comment
+    else if (a && c/*2*/) {
+      System.out.println("a&c"); // three
+    }
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/extractIfCondition/beforeRepeating2.java

@@ -0,0 +1,16 @@
+// "Extract if (a)" "true"
+class Test {
+  void f(boolean a, boolean b, boolean c, boolean d){
+    if (<caret>a && b)
+      System.out.println("a&b");//first comment
+    else if (a && c) {
+      System.out.println("a&c");//ac
+    }
+    else if (a) {
+      System.out.println("a");//a
+    }
+    else if (d) {
+      System.out.println("d");//d
+    }
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/extractIfCondition/beforeRepeating3.java

@@ -0,0 +1,16 @@
+// "Extract if (a)" "true"
+class Test {
+  void f(boolean a, boolean b, boolean c, boolean d){
+    if (<caret>a && b)
+      System.out.println("a&b");//first comment
+    else if (a) {
+      System.out.println("a");//a
+    }
+    else if (a && c) {
+      System.out.println("a&c");//ac
+    }
+    else if (a && d) {
+      System.out.println("a&d");//ad
+    }
+  }
+}