Make merge tool work when switching editors

package.json

@@ -106,7 +106,7 @@
         "c9.ide.run.build": "#0598fff697",
         "c9.ide.run.debug.xdebug": "#61dcbd0180",
         "c9.ide.save": "#4a4a60a004",
-        "c9.ide.scm": "#d92bb9aeb5",
+        "c9.ide.scm": "#a194f3ca85",
         "c9.ide.terminal.monitor": "#b76f1c9f24",
         "c9.ide.test": "#ba0ed6e586",
         "c9.ide.test.mocha": "#f6cc482886",

plugins/c9.ide.editors/tabmanager.js

@@ -178,7 +178,7 @@ define(function(require, module, exports) {
                 if (!editors.findEditor(e.value).fileExtensions.length)
                     openEditor(e.value, true, function(){});
                 else if (focussedTab)
-                    focussedTab.switchEditor(e.value, function(){});
+                    switchEditor(focussedTab, e.value, function(){});
             });
             editors.on("menuShow", function(e) {
                 var group, editor = focussedTab && focussedTab.editor;
@@ -1405,6 +1405,13 @@ define(function(require, module, exports) {
             return true;
         }
         
+        function switchEditor(tab, type, callback) {
+            tab.switchEditor(type, function(){
+                emit("switchEditor", { tab: tab });
+                callback.apply(this, arguments);
+            });
+        }
+        
         /**** Support for state preservation ****/
     
         function pauseTabResize(){
@@ -1956,6 +1963,11 @@ define(function(require, module, exports) {
              */
             clone: clone,
             
+            /**
+             * 
+             */
+            switchEditor: switchEditor,
+            
             /**
              * @ignore
              */