check if constructor already contains field assignment before add new one (IDEA-69792)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/createConstructorParameterFromField/afterAlreadyAssigned.java

@@ -0,0 +1,12 @@
+// "Add constructor parameter" "true"
+class A {
+  private final String text;
+
+  public Foo(String text) {
+    this.text = text;
+  }
+
+  public Foo(int i, String text) {
+      this.text = text;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/createConstructorParameterFromField/beforeAlreadyAssigned.java

@@ -0,0 +1,11 @@
+// "Add constructor parameter" "true"
+class A {
+  private final String te<caret>xt;
+
+  public Foo(String text) {
+    this.text = text;
+  }
+
+  public Foo(int i) {
+  }
+}