properly remove old keybindings when adding new one

lib/ace/keyboard/keybinding.js

@@ -62,8 +62,9 @@ var KeyBinding = function(editor) {
         if (this.$handlers[this.$handlers.length - 1] == kb)
             return;
 
-        this.$handlers = [];
-        this.setDefaultHandler(this.$defaultHandler);
+        while (this.$handlers[1])
+            this.removeKeyboardHandler(this.$handlers[1]);
+
         this.addKeyboardHandler(kb, 1);
     };
 

lib/ace/keyboard/vim/maps/util.js

@@ -23,6 +23,7 @@ module.exports = {
         editor.unsetStyle('normal-mode');
         if (editor.commands.recording)
             editor.commands.toggleRecording();
+        editor.setOverwrite(false);
     },
     insertMode: function(editor) {
         this.currentMode = 'insert';