ConstantConditionalExpressionInspection: add cast if necessary when type changes

Fixes IDEA-194648 Simpler expression auto-fix results in different code

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/constantConditional/afterNullReturn.java

@@ -0,0 +1,7 @@
+// "Simplify" "true"
+class Test {
+  String test(String foo) {
+      /*always false?*/
+      return null;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/constantConditional/afterSimple.java

@@ -0,0 +1,6 @@
+// "Simplify" "true"
+class Test {
+  int test(int a, int b) {
+    return a;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/constantConditional/afterTypeConversion.java

@@ -0,0 +1,7 @@
+// "Simplify" "true"
+class Test {
+  public static void main(String[] args) {
+    int i = 0;
+    System.out.println((int) 'x');
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/constantConditional/beforeNullReturn.java

@@ -0,0 +1,6 @@
+// "Simplify" "true"
+class Test {
+  String test(String foo) {
+    return (false/*always false?*/) ? foo<caret> : null;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/constantConditional/beforeSimple.java

@@ -0,0 +1,6 @@
+// "Simplify" "true"
+class Test {
+  int test(int a, int b) {
+    return true<caret>?a:b;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/constantConditional/beforeTypeConversion.java

@@ -0,0 +1,7 @@
+// "Simplify" "true"
+class Test {
+  public static void main(String[] args) {
+    int i = 0;
+    System.out.println(false <caret>? i : 'x');
+  }
+}