suggest the just appeared type variables when writing a method return type (IDEA-60681)

java/java-tests/testData/codeInsight/completion/normal/ReturningTypeVariable.java

@@ -0,0 +1,3 @@
+public class Beda {
+    public <Toooo> Tooo<caret>
+}

java/java-tests/testData/codeInsight/completion/normal/ReturningTypeVariable2.java

@@ -0,0 +1,3 @@
+public class Beda {
+    public <Toooo> Tooo<caret> x
+}

java/java-tests/testData/codeInsight/completion/normal/ReturningTypeVariable2_after.java

@@ -0,0 +1,3 @@
+public class Beda {
+    public <Toooo> Toooo<caret> x
+}

java/java-tests/testData/codeInsight/completion/normal/ReturningTypeVariable3.java

@@ -0,0 +1,3 @@
+public class Beda {
+    public <Toooo> Tooo<caret> a()
+}

java/java-tests/testData/codeInsight/completion/normal/ReturningTypeVariable3_after.java

@@ -0,0 +1,3 @@
+public class Beda {
+    public <Toooo> Toooo<caret> a()
+}

java/java-tests/testData/codeInsight/completion/normal/ReturningTypeVariable_after.java

@@ -0,0 +1,3 @@
+public class Beda {
+    public <Toooo> Toooo<caret>
+}