add ignoreLocked option to Screen.

README.md

@@ -172,6 +172,9 @@ The screen on which every other node renders.
 - **dump** - dump all output and input to desired file. can be used together
   with `log` option if set as a boolean.
 - **debug** - debug mode. enables usage of the `debug` method.
+- **ignoreLocked** - Array of keys in their full format (e.g. `C-c`) to ignore
+  when keys are locked. Useful for creating a key that will *always* exit no
+  matter whether the keys are locked.
 
 ##### Properties:
 

lib/widget.js

@@ -281,6 +281,8 @@ function Screen(options) {
   this.autoPadding = options.autoPadding;
   this.tabc = Array((options.tabSize || 4) + 1).join(' ');
 
+  this.ignoreLocked = options.ignoreLocked || [];
+
   this.dattr = ((0 << 18) | (0x1ff << 9)) | 0x1ff;
 
   this.renders = 0;
@@ -550,7 +552,9 @@ Screen.prototype._listenKeys = function(el) {
   // checks to make sure grabKeys, lockKeys, and focused
   // weren't changed, and handles those situations appropriately.
   this.program.on('keypress', function(ch, key) {
-    if (self.lockKeys) return;
+    if (self.lockKeys && !~self.ignoreLocked.indexOf(key.full)) {
+      return;
+    }
 
     var focused = self.focused
       , grabKeys = self.grabKeys;