[JENKINS-32027] Avoiding to refresh codemirror through the layoutUpdateCallback (#2390)

(cherry picked from commit 1e170d43)

core/src/main/resources/lib/form/textarea/textarea.js

@@ -2,13 +2,13 @@ Behaviour.specify("TEXTAREA.codemirror", 'textarea', 0, function(e) {
         //ensure, that textarea is visible, when obtaining its height, see JENKINS-25455
         function getTextareaHeight() {
             var p = e.parentNode.parentNode; //first parent is CodeMirror div, second is actual element which needs to be visible
-            var display = p.style.display; 
+            var display = p.style.display;
             p.style.display = "";
             var h = e.clientHeight;
             p.style.display = display;
             return h;
         }
-        
+
         var h = e.clientHeight || getTextareaHeight();
         var config = e.getAttribute("codemirror-config");
         config += (config ? ", " : " ") + "onBlur: function(editor){editor.save()}";
@@ -27,16 +27,10 @@ Behaviour.specify("TEXTAREA.codemirror", 'textarea', 0, function(e) {
 
         // the form needs to be populated before the "Apply" button
         if(e.up('form')) { // Protect against undefined element
-    		Element.on(e.up('form'),"jenkins:apply", function() {
-			e.value = codemirror.getValue()
-		})
-        }
-		
-        //refresh CM when there are some layout updates
-        function refreshCM() {
-            codemirror.refresh();
+            Element.on(e.up('form'),"jenkins:apply", function() {
+                e.value = codemirror.getValue()
+            })
         }
-        layoutUpdateCallback.add(refreshCM);
     });
 
 Behaviour.specify("DIV.textarea-preview-container", 'textarea', 100, function (e) {