[java-refactoring] Better vararg handling in change signature

1. Properly handle non-vararg call sites
2. Update callsites when vararg type was changed to non-vararg or vice versa (without reordering, etc.)
Fixes IDEA-318626 Change signature incorrectly wraps/unwraps arguments when changing between varargs and arrays

GitOrigin-RevId: 3372a144be4363fef2c40e8968a07d8ed6b916a6

java/java-tests/testData/refactoring/changeSignature/ArrayToVararg.java

@@ -0,0 +1,8 @@
+public class X
+{
+  void doSo<caret>mething(int x, String[] args) { /* ... */ }
+  
+  void use() {
+    doSomething(0, new String[]{"one", "two"});
+  }
+}

java/java-tests/testData/refactoring/changeSignature/ArrayToVararg_after.java

@@ -0,0 +1,8 @@
+public class X
+{
+  void doSomething(int x, String... args) { /* ... */ }
+  
+  void use() {
+    doSomething(0, "one", "two");
+  }
+}

java/java-tests/testData/refactoring/changeSignature/DefCtorVarargToArray.java

@@ -0,0 +1,8 @@
+class X {
+  <caret>X(String... args) {}
+  
+  X(int x) {
+    this();
+  }
+}
+class Y extends X {}

java/java-tests/testData/refactoring/changeSignature/DefCtorVarargToArray_after.java

@@ -0,0 +1,12 @@
+class X {
+  X(String[] args) {}
+  
+  X(int x) {
+    this(new String[]{});
+  }
+}
+class Y extends X {
+    Y() {
+        super(new String[]{});
+    }
+}

java/java-tests/testData/refactoring/changeSignature/EnumVarargToArray.java

@@ -0,0 +1,7 @@
+public enum X
+{
+  A(0, "foo", "bar"),
+  B(0, new String[]{"one", "two"});
+  
+  <caret>X(int x, String... args) { /* ... */ }
+}

java/java-tests/testData/refactoring/changeSignature/EnumVarargToArray_after.java

@@ -0,0 +1,7 @@
+public enum X
+{
+  A(0, new String[]{"foo", "bar"}),
+  B(0, new String[]{"one", "two"});
+  
+  X(int x, String[] args) { /* ... */ }
+}

java/java-tests/testData/refactoring/changeSignature/VarargToArray.java

@@ -0,0 +1,9 @@
+public class X
+{
+  void doSo<caret>mething(int x, String... args) { /* ... */ }
+  
+  void use() {
+    doSomething(0, "foo", "bar");
+    doSomething(0, new String[]{"one", "two"});
+  }
+}

java/java-tests/testData/refactoring/changeSignature/VarargToArrayReorder.java

@@ -0,0 +1,9 @@
+public class X
+{
+  void doSome<caret>thing(int x, String... args) { /* ... */ }
+  
+  void use() {
+    doSomething(0, "foo", "bar");
+    doSomething(0, new String[]{"one", "two"});
+  }
+}

java/java-tests/testData/refactoring/changeSignature/VarargToArrayReorder_after.java

@@ -0,0 +1,9 @@
+public class X
+{
+  void doSomething(String[] args, int x) { /* ... */ }
+  
+  void use() {
+    doSomething(new String[]{"foo", "bar"}, 0);
+    doSomething(new String[]{"one", "two"}, 0);
+  }
+}

java/java-tests/testData/refactoring/changeSignature/VarargToArray_after.java

@@ -0,0 +1,9 @@
+public class X
+{
+  void doSomething(int x, String[] args) { /* ... */ }
+  
+  void use() {
+    doSomething(0, new String[]{"foo", "bar"});
+    doSomething(0, new String[]{"one", "two"});
+  }
+}