Merge pull request +7244 from c9/fix/tree-pagedown

fix +7206 pressing pagedown screws up the layout of ace trees

node_modules/ace_tree/lib/ace_tree/virtual_renderer.js

@@ -839,31 +839,45 @@ var VirtualRenderer = function(container, cellWidth, cellHeight) {
 
     this.animateScrolling = function(fromValue, callback) {
         var toValue = this.scrollTop;
-        if (this.$animatedScroll && Math.abs(fromValue - toValue) < 100000) {
-            var _self = this;
-            var steps = _self.$calcSteps(fromValue, toValue);
-            this.$inScrollAnimation = true;
-
-            clearInterval(this.$timer);
-
-            _self.provider.setScrollTop(steps.shift());
-            this.$timer = setInterval(function() {
-                if (steps.length) {
-                    _self.setScrollTop(steps.shift());
-                    // trick provider to think it's already scrolled to not loose toValue
-                    _self.scrollTop = toValue;
-                } else if (toValue != null) {
-                    _self.scrollTop = -1;
-                    _self.setScrollTop(toValue);
-                    toValue = null;
-                } else {
-                    // do this on separate step to not get spurious scroll event from scrollbar
-                    _self.$timer = clearInterval(_self.$timer);
-                    _self.$inScrollAnimation = false;
-                    callback && callback();
-                }
-            }, 10);
+        if (!this.$animatedScroll)
+            return;
+        var _self = this;
+        
+        if (fromValue == toValue)
+            return;
+        
+        if (this.$scrollAnimation) {
+            var oldSteps = this.$scrollAnimation.steps;
+            if (oldSteps.length) {
+                fromValue = oldSteps[0];
+                if (fromValue == toValue)
+                    return;
+            }
         }
+        
+        var steps = _self.$calcSteps(fromValue, toValue);
+        this.$scrollAnimation = {from: fromValue, to: toValue, steps: steps};
+
+        clearInterval(this.$timer);
+
+        _self.provider.setScrollTop(steps.shift());
+        // trick provider to think it's already scrolled to not loose toValue
+        _self.provider.$scrollTop = toValue;
+        this.$timer = setInterval(function() {
+            if (steps.length) {
+                _self.provider.setScrollTop(steps.shift());
+                _self.provider.$scrollTop = toValue;
+            } else if (toValue != null) {
+                _self.provider.$scrollTop = -1;
+                _self.provider.setScrollTop(toValue);
+                toValue = null;
+            } else {
+                // do this on separate step to not get spurious scroll event from scrollbar
+                _self.$timer = clearInterval(_self.$timer);
+                _self.$scrollAnimation = null;
+                callback && callback();
+            }
+        }, 10);
     };
 
     /**

package.json

@@ -92,7 +92,7 @@
         "c9.ide.immediate": "#6845a93705",
         "c9.ide.installer": "#19b25fc787",
         "c9.ide.mount": "#896ebf836e",
-        "c9.ide.navigate": "#64156c7f4a",
+        "c9.ide.navigate": "#7c58c7f3d7",
         "c9.ide.newresource": "#f1f0624768",
         "c9.ide.openfiles": "#28a4f5af16",
         "c9.ide.preview": "#0bd8dd6e8c",

plugins/c9.ide.keys/commands.js

@@ -245,7 +245,7 @@ define(function(require, exports, module) {
         
         function setDefault(name, keys) {
             var command = commands[name];
-            
+            if (!command) return;
             // If bind key is not yet overridden by a custom one
             if (plugin.commandManager[name] == command.bindKey[platform])
                 bindKey(keys[platform], command);