Match the right boundary when searching for elements (#301)

Fixes #300.

Author: nya3jp

src/main/java/org/javacs/FindNameAt.java

@@ -99,6 +99,6 @@ private boolean contains(Tree t, CharSequence name, long find) {
         start = FindHelper.findNameIn(root, name, start, end);
         end = start + name.length();
         if (start == -1 || end == -1) return false;
-        return start <= find && find < end;
+        return start <= find && find <= end;
     }
 }

src/test/java/org/javacs/GotoTest.java

@@ -75,6 +75,14 @@ public void methodReference() {
         assertThat(suggestions, hasItem("Goto.java:41"));
     }
 
+    @Test
+    public void wordBoundary() {
+        for (var column = 9; column <= 14; column++) {
+            var suggestions = doGoto(file, 10, column);
+            assertThat(suggestions, hasItem("Goto.java:5"));
+        }
+    }
+
     @Test
     public void otherStaticMethod() {
         var suggestions = doGoto(file, 29, 25);