fix ctrl-dragging a file

node_modules/ace_tree/lib/ace_tree/mouse/default_handlers.js

@@ -143,9 +143,9 @@ function DefaultHandlers(mouseHandler) {
                 editor.selection.toggleSelect(node);
             }
         } else if (ev.getAccelKey()) {
-            if (isMultiSelect && inSelection)
+            if (inSelection && isMultiSelect)
                 this.delayedSelect = "toggle";
-            else
+            else if (!inSelection || isMultiSelect)
                 editor.selection.toggleSelect(node);
         } else if (ev.getShiftKey()) {
             editor.selection.expandSelection(node);