Reuse former session of second split. Add destroy function that stops some timeouts.

demo/demo.js

@@ -369,7 +369,10 @@ exports.launch = function(env) {
     bindDropdown("split", function(value) {
         var sp = env.split;
         if (value == "none") {
+            if (sp.getSplits() == 2) {
+                secondSplitSession = sp.getEditor(1).session;
                 sp.setSplits(1);
+            }
         } else {
             var newEditor = (sp.getSplits() == 1);
             if (value == "below") {
@@ -383,7 +386,6 @@ exports.launch = function(env) {
                 var session = secondSplitSession || sp.getEditor(0).session;
                 var newSession = sp.setSession(session, 1);
                 newSession.name = session.name;
-                secondSplitSession = newSession;
             }
         }
     });

lib/ace/editor.js

@@ -1123,6 +1123,10 @@ var Editor =function(renderer, session) {
         this.session.getUndoManager().redo();
     };
 
+    this.destroy = function() {
+        this.renderer.destroy();
+    }
+
 }).call(Editor.prototype);
 
 

lib/ace/layer/cursor.js

@@ -133,6 +133,10 @@ var Cursor = function(parentEl) {
         this.restartTimer();
     };
 
+    this.destroy = function() {
+        clearInterval(this.blinkId);
+    }
+
 }).call(Cursor.prototype);
 
 exports.Cursor = Cursor;

lib/ace/layer/text.js

@@ -82,7 +82,7 @@ var Text = function(parentEl) {
 
     this.$pollSizeChanges = function() {
         var self = this;
-        setInterval(function() {
+        this.$pollSizeChangesTimer = setInterval(function() {
             self.checkForSizeChanges();
         }, 500);
     };
@@ -517,6 +517,10 @@ var Text = function(parentEl) {
         this.$renderLineCore(stringBuilder, row, renderTokens, splits);
     };
 
+    this.destroy = function() {
+        clearInterval(this.$pollSizeChangesTimer);
+    };
+
 }).call(Text.prototype);
 
 exports.Text = Text;

lib/ace/split.js

@@ -103,6 +103,7 @@ var Split = function(container, theme, splits) {
         } else {
             while (this.$splits > splits) {
                 editor = this.$editors[this.$splits - 1];
+                editor.destroy();
                 this.$container.removeChild(editor.container);
                 this.$editors.pop();
                 this.$splits --;

lib/ace/virtual_renderer.js

@@ -794,6 +794,11 @@ var VirtualRenderer = function(container, theme) {
       dom.removeCssClass(this.container, style)
     };
 
+    this.destroy = function() {
+        this.$textLayer.destroy();
+        this.$cursorLayer.destroy();
+    }
+
 }).call(VirtualRenderer.prototype);
 
 exports.VirtualRenderer = VirtualRenderer;