fix collecting completion stats for methods with argument suggestions

ensure that we don't change the tracked document range when starting live template

java/java-tests/testData/codeInsight/completion/signature/CollectStatisticsOnMethods.java

@@ -0,0 +1,8 @@
+class A {
+    {
+        tes<caret>
+    }
+
+    void test2(int a);
+    void test1(int a);
+}

java/java-tests/testData/codeInsight/completion/signature/CollectStatisticsOnMethods_after.java

@@ -0,0 +1,8 @@
+class A {
+    {
+        test2(2)<caret>;
+    }
+
+    void test2(int a);
+    void test1(int a);
+}