lambda -> method ref: allow conversion with any qualifier, show warning only for trivial qualifiers; same for anonymous -> method ref (IDEA-CR-16052)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/lambda2methodReference/afterNoParamsQualifier.java

@@ -0,0 +1,13 @@
+// "Replace lambda with method reference" "true"
+class Example {
+  public void m() {
+  }
+
+  {
+    Runnable r = ex()::m;
+  }
+  
+  Example ex() {
+    return this;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/lambda2methodReference/beforeNoParamsQualifier.java

@@ -1,4 +1,4 @@
-// "Replace lambda with method reference" "false"
+// "Replace lambda with method reference" "true"
 class Example {
   public void m() {
   }