model.js; update tests

link to #3697

browser/js/model.js

@@ -1199,13 +1199,17 @@ changeAlleleNotation: function(alleleNotation) {
     displayTop: function (top) {
         top = typeof top !== 'undefined' ? top : this.top;
 
-        this.top = top;
 
         if (top < 0)
             top = 0
+        // Remember the top setted
+        // Allow to keep this values between various samples
+        this.top = top;
+
+        // top show cannot be greater than the number of clones
         if (top > this.countRealClones())
             top = this.countRealClones()
-
+        this.current_top = top
 
         var html_slider = document.getElementById('top_slider');
         if (html_slider !== null) {

browser/test/QUnit/testFiles/model_test.js

@@ -116,7 +116,8 @@ QUnit.test("top clones", function(assert) {
     m.displayTop(-10)
     assert.equal(m.top, 0, "Top cannot be negative")
     m.displayTop(m.countRealClones() * 2 + 10)
-    assert.equal(m.top, m.countRealClones(), "Top cannot be greater than the number of real clones")
+    
+    assert.equal(m.current_top, m.countRealClones(), "Top cannot be greater than the number of real clones")
 
     m.displayTop(1)