[occur] fixing recursive occurs

lib/ace/occur_test.js

@@ -120,6 +120,29 @@ module.exports = {
         editor.execCommand('occuraccept');
 
         assert.position(editor.getCursorPosition(), 3, 1, 'occur -> original pos');
+    },
+
+    "test: recursive occur" : function() {
+        // setup
+        var text = 'x\nabc1\nx\nabc2\n';
+        editor.session.insert({row: 0, column: 0}, text);
+        editor.commands.addCommands(occurCommands);
+
+        // orig -> occur1
+        editor.execCommand('occur', {needle: 'abc'});
+        assert.equal(editor.getValue(), 'abc1\nabc2', "orig -> occur1");
+
+        // occur1 -> occur2
+        editor.execCommand('occur', {needle: '2'});
+        assert.equal(editor.getValue(), 'abc2', "occur1 -> occur2");
+
+        // occur2 -> occur1
+        editor.execCommand('occurexit');
+        assert.equal(editor.getValue(), 'abc1\nabc2', "occur2 -> occur1");
+
+        // occur1 -> orig
+        editor.execCommand('occurexit');
+        assert.equal(editor.getValue(), text, "occur1 -> orig");
     }
 
 };